procession vs cavalcade

procession and cavalcade both are nouns.

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

As nouns, cavalcade is a hyponym of procession; that is, cavalcade 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
cavalcade: a procession of people traveling on horseback

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

procession (noun)	cavalcade (noun)
the group action of a collection of people or animals or vehicles moving ahead in more or less regular formation	a procession of people traveling on horseback
the act of moving forward (as toward a goal)
(theology) the origination of the Holy Spirit at Pentecost