rave vs rabbit on

rave is a noun but rabbit on is not a noun.

Word	Noun	Adjective	Verb	Adverb
rave	Yes	No	Yes	No
rabbit on	No	No	Yes	No

As verbs, rave and rabbit on are synonyms defined as:

Other synonyms of rave include jabber, mouth off, rant, spout.

rave (noun)	rabbit on (noun)
an extravagantly enthusiastic review
a dance party that lasts all night and electronically synthesized music is played

rave (verb)	rabbit on (verb)
praise enthusiastically	talk in a noisy, excited, or declamatory manner
talk in a noisy, excited, or declamatory manner
participate in an all-night techno dance party