requester vs canvasser

requester and canvasser both are nouns.

Word	Noun	Adjective	Verb	Adverb
requester	Yes	No	No	No
canvasser	Yes	No	No	No

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

Other hyponyms of requester include besieger, postulant, solicitor.

requester (noun)	canvasser (noun)
one praying humbly for something	someone who conducts surveys of public opinion
	someone who examines votes at an election
	a petitioner who solicits contributions or trade or votes
	a person who takes or counts votes