broach vs discuss

broach is a noun but discuss is not a noun.

Word	Noun	Adjective	Verb	Adverb
broach	Yes	No	Yes	No
discuss	No	No	Yes	No

As verbs, discuss is a hypernym of broach; that is, discuss is a word with a broader meaning than broach:

broach: bring up a topic for discussion
discuss: speak with others about (something); talk (something) over in detail; have a discussion

Other hypernyms of broach include hash out, talk over.

broach (noun)	discuss (noun)
a decorative pin worn by women

broach (verb)	discuss (verb)
bring up a topic for discussion	speak with others about (something); talk (something) over in detail; have a discussion
	to consider or examine in speech or writing