talk show vs chat show

talk show and chat show both are nouns.

Word	Noun	Adjective	Verb	Adverb
talk show	Yes	No	No	No
chat show	Yes	No	No	No

As nouns, talk show and chat show are synonyms defined as:

talk show and chat show: a program during which well-known people discuss a topic or answer questions telephoned in by the audience

talk show (noun)	chat show (noun)
a program during which well-known people discuss a topic or answer questions telephoned in by the audience	a program during which well-known people discuss a topic or answer questions telephoned in by the audience