invite vs. tempt

imprecation vs. malediction

infomercial vs. informercial

inception vs. origination

isomerisation vs. isomerization

impregnation vs. saturation

independence vs. independency

inquietude vs. uneasiness

impassivity vs. unemotionality

impassiveness vs. unemotionality

intoxication vs. poisoning

infuriation vs. madness

indignation vs. outrage

insouciance vs. lightsomeness

ingratitude vs. ungratefulness

irascibility vs. spleen

initiate vs. pundit

initiate vs. savant

initiate vs. novice

initiate vs. start

initiate vs. pioneer

induct vs. initiate

infestation vs. plague

institute vs. plant

irredenta vs. irridenta

isarithm vs. isogram

isarithm vs. isopleth

indument vs. indumentum

isle vs. islet

invigorator vs. quickener

imp vs. monkey

incubus vs. nightmare

intermediator vs. mediator

intermediary vs. mediator

intercessor vs. mediator

imitator vs. impersonator

inmate vs. inpatient

investigator vs. researcher

inebriate vs. soak

inebriate vs. thrill

imbiber vs. juicer

imam vs. imaum

interlocutor vs. middleman

intern vs. interne

introvert vs. invaginate

interloper vs. intruder

invalidator vs. voider

infantryman vs. marcher

informant vs. source

informant vs. witness

informer vs. rat

irredentist vs. irridentist

inoculator vs. vaccinator

inquirer vs. questioner

inquirer vs. querier

ideologist vs. ideologue

inquisitor vs. interrogator

initiator vs. instigator

instigator vs. provoker

inciter vs. instigator

instigant vs. instigator

idolater vs. idolizer

idolater vs. idoliser

idoliser vs. idolizer

illusionist vs. visionary

instrumentalist vs. player

Ishmael vs. outcast

inducer vs. persuader

innovator vs. pioneer

ironist vs. satirist

impresario vs. promoter

instructor vs. teacher

idealogue vs. theorist

impedance vs. resistance

imbauba vs. trumpetwood

indemnity vs. restitution

inflow vs. influx

intellectualisation vs. intellectualization

intumescence vs. intumescency

intumescence vs. swelling

ionisation vs. ionization

infrigidation vs. refrigeration

indebtedness vs. obligation

indebtedness vs. liability

irrelevance vs. irrelevancy

intransitiveness vs. intransitivity

incisura vs. incisure

interdependence vs. interdependency

interdependence vs. mutuality

interrelation vs. interrelationship

interrelatedness vs. interrelation

immanence vs. immanency

inherence vs. inherency

irreality vs. unreality

infertility vs. sterility

imminence vs. imminency

imminence vs. imminentness

imminence vs. impendence

imminence vs. impendency

impeachability vs. indictability

ictus vs. seizure

illness vs. unwellness

illness vs. malady

illness vs. sickness

induration vs. sclerosis

ischaemia vs. ischemia

infarct vs. infarction

icterus vs. jaundice

insaneness vs. lunacy

irrationality vs. unreason

infamy vs. opprobrium

ignominy vs. shame

integrality vs. totality

incompleteness vs. rawness

imperfection vs. imperfectness

immatureness vs. immaturity

impureness vs. impurity

indigence vs. need

impecuniousness vs. penuriousness

immaculateness vs. spotlessness

inconceivability vs. inconceivableness

isinglass vs. mica

iridosmine vs. osmiridium

insulator vs. nonconductor

isoleucine vs. lysine

isoleucine vs. valine

imidazole vs. iminazole

inoculant vs. inoculum

invertase vs. saccharase

invertase vs. sucrase

idocrase vs. vesuvianite

incipience vs. incipiency

inhale vs. inspire

inspire vs. revolutionize

inspire vs. revolutionise

inspire vs. prompt

invigorate vs. reinvigorate

invigorate vs. quicken

inseminate vs. sow

impregnate vs. saturate

impregnate vs. tincture

irritate vs. rag

inflame vs. wake

inflame vs. light

inflame vs. kindle

immunize vs. inoculate

immunise vs. inoculate

inoculate vs. vaccinate

indispose vs. unfit

irrigate vs. water

injure vs. wound

inunct vs. oil

inject vs. shoot

inject vs. interject

inject vs. interpose

infuse vs. steep

infuse vs. tincture

infuse vs. instill

inculcate vs. infuse

intoxicate vs. soak

intoxicate vs. uplift

infect vs. taint

impoverish vs. pull

inspirit vs. spirit

inaugurate vs. introduce

introduce vs. present

introduce vs. preface

innovate vs. introduce

interpolate vs. value

interlard vs. intersperse

immobilize vs. trap

immobilise vs. trap

intumesce vs. swell

impair vs. spoil

imbue vs. soak

irradiate vs. ray

illume vs. light

illumine vs. light

illuminate vs. light

interpose vs. intervene

interfere vs. intervene

iterate vs. repeat

invert vs. reverse

involve vs. need

imply vs. involve

involve vs. regard

individualize vs. personalize

individualize vs. personalise

individualise vs. personalize

individualise vs. personalise

inhibit vs. suppress

integrate vs. unite

integrate vs. mix

invalidate vs. void

invalidate vs. nullify

inspissate vs. thicken

insulate vs. isolate

isolate vs. sequester

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