procession vs convoy

procession and convoy both are nouns.

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

As nouns, convoy is a hyponym of procession; that is, convoy 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
convoy: a procession of land vehicles traveling together

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

procession (noun)	convoy (noun)
the group action of a collection of people or animals or vehicles moving ahead in more or less regular formation	the act of escorting while in transit
the act of moving forward (as toward a goal)	a procession of land vehicles traveling together
(theology) the origination of the Holy Spirit at Pentecost	a collection of merchant ships with an escort of warships

procession (verb)	convoy (verb)
	escort in transit