hemicrania vs. megrim

haematoma vs. hematoma

hyperglycaemia vs. hyperglycemia

hypoglycaemia vs. hypoglycemia

haemothorax vs. hemothorax

hyperaemia vs. hyperemia

hives vs. urtication

hurting vs. pain

haematuria vs. hematuria

haemoglobinuria vs. hemoglobinuria

haemosiderosis vs. hemosiderosis

heartburn vs. pyrosis

hemorrhoid vs. piles

haemorrhoid vs. piles

haematocele vs. hematocele

hematocele vs. hematocoele

haematocoele vs. hematocele

haematocolpometra vs. hematocolpometra

haematocolpos vs. hematocolpos

hiccough vs. hiccup

hiccup vs. singultus

huff vs. miff

huff vs. puff

huff vs. snort

hypochondria vs. hypochondriasis

hydrocephalus vs. hydrocephaly

hyperdactyly vs. polydactyly

humidity vs. humidness

hypertonia vs. hypertonus

hypertonia vs. hypertonicity

hypesthesia vs. hypoesthesia

hypotonia vs. hypotonus

hypotonia vs. hypotonicity

hyperacusia vs. hyperacusis

hazardousness vs. perilousness

hypermetropia vs. hyperopia

hypermetropy vs. hyperopia

hyperopia vs. longsightedness

hemianopia vs. hemianopsia

hydrargyrum vs. mercury

holmium vs. lutetium

hornfels vs. hornstone

haemoprotein vs. hemoprotein

haematite vs. hematite

haemolysin vs. hemolysin

herbicide vs. weedkiller

haemosiderin vs. hemosiderin

haemoglobin vs. hemoglobin

haem vs. heme

hematin vs. heme

haemitin vs. heme

heme vs. protoheme

hemin vs. protohemin

holiday vs. vacation

hebdomad vs. week

hypnotize vs. mesmerize

hypnotize vs. mesmerise

hypnotise vs. mesmerize

hypnotise vs. mesmerise

heal vs. mend

humidify vs. moisturize

humidify vs. moisturise

habituate vs. use

heighten vs. raise

heighten vs. sharpen

heighten vs. rise

harden vs. indurate

harden vs. temper

handcolor vs. handcolour

happen vs. pass

happen vs. materialise

happen vs. materialize

harry vs. ravage

hasten vs. rush

hasten vs. speed

harmonize vs. reconcile

harmonise vs. reconcile

hydrolyse vs. hydrolyze

hear vs. see

hear vs. listen

hear vs. try

hoodwink vs. juggle

hyperbolize vs. magnify

hyperbolise vs. magnify

hinder vs. impede

hoover vs. vacuum

hygienize vs. sanitize

hygienize vs. sanitise

hygienise vs. sanitize

hygienise vs. sanitise

haemagglutinate vs. hemagglutinate

hanker vs. long

hover vs. levitate

hover vs. wiggle

hover vs. vibrate

hover vs. loom

hie vs. speed

hark vs. harken

hark vs. hearken

hornswoggle vs. scam

hesitate vs. waver

hesitate vs. pause

incessantly vs. unceasingly

incessantly vs. unendingly

ill vs. poorly

ill vs. ominous

ill vs. sick

immensely vs. vastly

intimately vs. well

intimately vs. nearly

immoderately vs. unreasonably

instantaneously vs. outright

instantaneously vs. instantly

indeed vs. so

instantly vs. now

immediately vs. instantly

instantly vs. straightaway

incredibly vs. unbelievably

improbably vs. incredibly

implausibly vs. incredibly

insanely vs. madly

intolerably vs. unacceptably

indefatigably vs. tirelessly

indefatigably vs. inexhaustibly

instead vs. rather

increasingly vs. progressively

indiscriminately vs. randomly

indiscriminately vs. promiscuously

impromptu vs. offhand

impromptu vs. offhanded

impromptu vs. unrehearsed

indoors vs. inside

inside vs. within

inside vs. inwardly

inner vs. inside

inside vs. privileged

inside vs. interior

irrespective vs. regardless

inevitably vs. necessarily

inevitably vs. needs

inescapably vs. inevitably

ineluctably vs. inevitably

inevitably vs. unavoidably

inevitably vs. perforce

inappropriately vs. unsuitably

illegally vs. illicitly

illegally vs. lawlessly

illegitimately vs. illicitly

irritably vs. testily

irritably vs. petulantly

irritably vs. pettishly

inversely vs. reciprocally

independently vs. singly

inaccurately vs. incorrectly

inaccurately vs. wrongly

inaccurately vs. wrong

imposingly vs. impressively

individually vs. singly

invitingly vs. tantalizingly

impolitely vs. rudely

irresistibly vs. overwhelmingly

ineptly vs. infelicitously

inadvertently vs. unwittingly

inauspiciously vs. unpropitiously

immeasurably vs. infinitely

inexcusably vs. unpardonably

inexcusably vs. unforgivably

inexcusably vs. unjustifiably

item vs. point

item vs. token

item vs. particular

inshore vs. onshore

inward vs. inwards

in vs. inward

inbound vs. inward

inarticulately vs. ineloquently

inexpensively vs. tattily

indecorously vs. unbecomingly

inconsequentially vs. inconsequently

incredulously vs. unbelievingly

ineffectively vs. inefficaciously

imprecisely vs. inexactly

incomparably vs. uncomparably

idly vs. lazily

illegibly vs. undecipherably

illegibly vs. unreadably

indescribably vs. ineffably

ineffably vs. unutterably

ineffably vs. unspeakably

impenitently vs. unrepentantly

informatively vs. instructively

imperatively vs. peremptorily

imperceptibly vs. unnoticeably

impetuously vs. impulsively

impishly vs. puckishly

importantly vs. significantly

incisively vs. precisely

impalpably vs. insubstantially

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