Words That Start With I: Your Scrabble Cheat Sheet

Have illuminating words infiltrated your vocabulary? When you indulge in a game of Scrabble or Words with Friends, impress your friends with an influx of words that start with the letter I. In each idle instant, invite some I-words into your ideation by including them in your iambic verse. I is the ninth letter of the English alphabet, but it introduces some inventive and inspiring idioms! So, if you insist on improving your vocabulary, inspect this index for important inroads.
We’ve created this list of words for you, organized by the number of letters in each word. Many of these words have more than one meaning. For simplicity, we’ve only listed one definition for each word. Keep in mind, this word list doesn’t contain every single English word that starts with I; however, it’s a useful introduction to this very special letter.

Your writing, at its best

Compose bold, clear, mistake-free, writing with Grammarly's AI-powered writing assistant

Here are some words that start with I [2-15 letter words]

15-Letter Words

immaterialities – Noun | Things of no important consequence

immunomodulator – Noun | A drug or another substance that affects the immune system

improvisational – Adjective | Pertaining to an art or act performed without preparation

incomprehension – Noun | Lack of understanding

14-Letter Words

ichthyosaurian – Adjective | Pertaining to extinct marine reptiles of the order Ichthyosauria

idealistically – Adverb | In a manner marked by the pursuit of high or noble principles, purposes, or goals

implacableness – Noun | Inability to be appeased or pacified

intercommunity – Adjective | Pertaining to a relationship between two or more communities

13-Letter Words

idiomatically – Adverb | In a manner unique to a particular language

immunochemist – Noun | A scientist who studies the branch of chemistry pertaining to immunology

impassionedly – Adverb | In a manner marked by passion or zeal

improbability – Noun | Something unlikely to occur

12-Letter Words

idiosyncrasy – Noun | A characteristic or behavior that is unique to an individual

immeasurable – Adjective | Indefinitely large

immortalizes – Verb | Exempts from death

immunization – Noun | The process of becoming protected from a disease

11-Letter Words

ignominious – Adjective | Despicable

illuminated – Verb | Brightened with light

impermeable – Adjective | Not permitting the passage of fluid

Iridization – Noun | A halo around light observed by patients with glaucoma

10-Letter Words

impeccable – Adjective | Faultless

imposthume – Noun | An abscess (also spelled impostume)

inadequate – Adjective | Inept or unsuitable

ionization – Noun | The formation of ions resulting from electrical discharge, radiation, etc.

9-Letter Words

indexless – Adjective | Having no list of items

indicator – Noun | An instrument for measurement, gauge 

indignity – Noun | Demeaning treatment

infirmary – Noun | Medical facility

8-Letter Words

idealize – Verb | To exalt something to a state of perfection

immunity – Noun | The condition of being able to resist a particular disease

inimical – Adjective | Hostile and unfriendly

intimacy – Noun | Close familiarity

7-Letter Words

idolize – Verb | To worship as a god

ignoble – Adjective | Dishonorable

indicia – Noun | Distinctive marks

infarct – Noun | Necrotic tissue resulting from inadequate blood flow 

inkling – Noun | The slightest suggestion

invitee – Noun | A welcome and invited person

6-Letter Words

icebox – Noun | A refrigerator

icicle –  Noun | Ice formed by dripping water

idiocy – Noun | Stupid behavior

iguana – Noun | A large American lizard of the family ‎Iguanidae

illite – Noun | Clay minerals with the crystal structure of muscovite

immure – Verb | To imprison

impala – Noun | A medium-sized African antelope, Aepyceros melampus

impark – Verb | To confine in a park

impish – Adjective | Mischievous 

infamy – Noun | Evil or scandalous reputation

5-Letter Words

idler – Noun | A lazy person

idyll – Noun | A poem dealing with pastoral scenes

igloo – Noun | Dome-like structures built by Inuit, Inupiat, and Yupik peoples (also spelled iglu) 

ihram – Noun | Plain clothing worn by Muslims on a ceremonial pilgrimage to Mecca

ileum – Noun |  The lowest part of the small intestine 

ilium – Noun | The uppermost, largest bones on either side of the pelvis

imago – Noun | A sexually mature, winged insect

imbue – Verb | To endow

imide – Noun | A compound derived from ammonia

inane – Adjective | Silly, insignificant

incus – Noun | The centermost bone in a mammal’s ear

infix – Verb | To fasten or insert

ingot – Noun | A mold for casting metal

inker – Noun | A tattoo artist

inure – Verb | To habituate something undesirable 

iroko- Noun | An African hardwood of the genus Chlorophora 

islet – Noun | A small island

istle – Noun | A strong tropical fiber used for weaving

4-Letter Words

iamb – Noun | A metrical foot with one unstressed and then one stressed syllable

ibex – Noun | Wild goats of the genus​ Capra

ibis – Noun | Wading birds of the family Threskiornithidae

ilex – Noun | Holly of the family Ilex

iota – Noun | The ninth letter of the Greek alphabet

inby – Adverb | In an inward direction (also spelled inbye)

ired – Verb | Angered

ixia – Noun | African plants of the family Iridaceae

izar – Noun | Traditional outer garment worn by Muslim women

3-Letter Words

icy – Adjective | Covered with ice

imp – Noun | A mischievous child

ink – Noun | Colored liquid used for writing and printing

iwi – Noun | A Maori tribe

2-Letter Words

id -Noun | A term used in psychoanalysis to describe an unconscious part of the psyche

if – Conjunction | Assuming that

in – Preposition | A function word to indicate position within limits

is – Verb | Present tense third-person singular of “be”

By looking at this list, you may be able to identify some common prefixes. Words that start with “immun-” often have something to do with immunity or safety. Words beginning with “inter-” involve the relationship between or among different things. Understanding these linguistic patterns can help you intuit what a word means, even when you don’t have a dictionary handy.

Use words that start with the letter I to indoctrinate your idols with intelligent ideas. Inspire others with incredible idylls. In the event that you internalize this list, no word finder, word game, or crossword puzzle will infuriate you. Instead, you’ll be inoculating yourself against ineptitude and issuing influential I-words—from is to immaterialities.


  1. https://www.merriam-webster.com
  2. https://www.collinsdictionary.com
  3. https://www.dictionary.com
  4. https://word.tips/words-start-with/i/
  5. https://www.yourdictionary.com/