humor vs ill humour

humor and ill humour both are nouns.

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

As nouns, ill humour is a hyponym of humor; that is, ill humour is a word with a more specific, narrower meaning than humor:

humor (noun)	ill humour (noun)
the quality of being funny	an angry and disagreeable mood
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

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