gossip vs chat

gossip and chat both are nouns.

Word	Noun	Adjective	Verb	Adverb
gossip	Yes	No	Yes	No
chat	Yes	No	Yes	No

As nouns, chat is a hypernym of gossip; that is, chat is a word with a broader meaning than gossip:

Other hypernyms of gossip include confab, confabulation, schmoose, schmooze.

As verbs, gossip and chat are synonyms defined as:

gossip (noun)	chat (noun)
light informal conversation for social occasions	songbirds having a chattering call
a report (often malicious) about the behavior of other people	birds having a chattering call
a person given to gossiping and divulging personal information about others	an informal conversation

gossip (verb)	chat (verb)
wag one's tongue; speak about others and reveal secrets or intimacies	talk socially without exchanging too much information
talk socially without exchanging too much information