declamation vs rant

declamation and rant both are nouns.

Word	Noun	Adjective	Verb	Adverb
declamation	Yes	No	No	No
rant	Yes	No	Yes	No

As nouns, rant is a hyponym of declamation; that is, rant is a word with a more specific, narrower meaning than declamation:

Other hyponyms of declamation include broadside, philippic, tirade, harangue, ranting, raving.

declamation (noun)	rant (noun)
vehement oratory	pompous or pretentious talk or writing
recitation of a speech from memory with studied gestures and intonation as an exercise in elocution or rhetoric	a loud bombastic declamation expressed with strong emotion

declamation (verb)	rant (verb)
	talk in a noisy, excited, or declamatory manner