hokum vs subject matter

hokum and subject matter both are nouns.

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

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

Other hypernyms of hokum include content, message, substance.

hokum (noun)	subject matter (noun)
a message that seems to convey no meaning	content communicating a message; what something is about