talk about vs talk over

talk about and talk over both are verbs.

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

As verbs, talk over is a hyponym of talk about; that is, talk over is a word with a more specific, narrower meaning than talk about:

talk about: discuss or mention
talk over: speak with others about (something); talk (something) over in detail; have a discussion

Other hyponyms of talk about include discuss, hash out, blaspheme.

talk about (verb)	talk over (verb)
to consider or examine in speech or writing	speak with others about (something); talk (something) over in detail; have a discussion
discuss or mention