procession vs caravan

procession and caravan both are nouns.

Word	Noun	Adjective	Verb	Adverb
procession	Yes	No	No	No
caravan	Yes	No	Yes	No

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

procession: the group action of a collection of people or animals or vehicles moving ahead in more or less regular formation
caravan: a procession (of wagons or mules or camels) traveling together in single file

Other hyponyms of procession include convoy, train, wagon train, cavalcade, march, motorcade, parade, cortege, recession, recessional.

procession (noun)	caravan (noun)
the group action of a collection of people or animals or vehicles moving ahead in more or less regular formation	a camper equipped with living quarters
the act of moving forward (as toward a goal)	a procession (of wagons or mules or camels) traveling together in single file
(theology) the origination of the Holy Spirit at Pentecost

procession (verb)	caravan (verb)
	travel in a caravan