humor vs ill humor

humor and ill humor both are nouns.

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

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

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