chat show vs talk show

chat show and talk show both are nouns.

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

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

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

chat show (noun)	talk 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