broach vs talk over

broach is a noun but talk over is not a noun.

Word	Noun	Adjective	Verb	Adverb
broach	Yes	No	Yes	No
talk over	No	No	Yes	No

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

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

Other hypernyms of broach include discuss, hash out.

broach (noun)	talk over (noun)
a decorative pin worn by women

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