ill humour vs humor

ill humour and humor both are nouns.

Word	Noun	Adjective	Verb	Adverb
ill humour	Yes	No	No	No
humor	Yes	No	Yes	No

As nouns, humor is a hypernym of ill humour; that is, humor is a word with a broader meaning than ill humour:

Other hypernyms of ill humour include humour, mood, temper.

ill humour (noun)	humor (noun)
an angry and disagreeable mood	the quality of being funny
	the trait of appreciating (and being able to express) the humorous
	the liquid parts of the body
	(Middle Ages) one of the four fluids in the body whose balance was believed to determine your emotional and physical state
	a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
	a characteristic (habitual or relatively temporary) state of feeling

ill humour (verb)	humor (verb)
	put into a good mood