petition vs collection

petition and collection both are nouns.

Word	Noun	Adjective	Verb	Adverb
petition	Yes	No	Yes	No
collection	Yes	No	No	No

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

petition: a formal message requesting something that is submitted to an authority
collection: request for a sum of money

Other hyponyms of petition include application, appeal, ingathering, solicitation, demand.

petition (noun)	collection (noun)
a formal message requesting something that is submitted to an authority	the act of gathering something together
reverent petition to a deity	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole

petition (verb)	collection (verb)
write a petition for something to somebody; request formally and in writing