wit vs subject matter

wit and subject matter both are nouns.

Word	Noun	Adjective	Verb	Adverb
wit	Yes	No	No	No
subject matter	Yes	No	No	No

As nouns, subject matter is a hypernym of wit; that is, subject matter is a word with a broader meaning than wit:

wit: a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
subject matter: content communicating a message; what something is about

Other hypernyms of wit include content, message, substance.

wit (noun)	subject matter (noun)
mental ability	content communicating a message; what something is about
a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter
a witty amusing person who makes jokes