rumor vs gossip

rumor and gossip both are nouns.

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

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

rumor: gossip (usually a mixture of truth and untruth) passed around by word of mouth
gossip: a report (often malicious) about the behavior of other people

Other hypernyms of rumor include comment, scuttlebutt.

As verbs, gossip is a hypernym of rumor; that is, gossip is a word with a broader meaning than rumor:

rumor: tell or spread rumors
gossip: wag one's tongue; speak about others and reveal secrets or intimacies

Other hypernyms of rumor include dish the dirt.

rumor (noun)	gossip (noun)
gossip (usually a mixture of truth and untruth) passed around by word of mouth	light informal conversation for social occasions
	a report (often malicious) about the behavior of other people
	a person given to gossiping and divulging personal information about others

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