inspector vs canvasser

inspector and canvasser both are nouns.

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

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

Other hyponyms of inspector include bank examiner, checker, scrutiniser, scrutinizer, scrutineer.

inspector (noun)	canvasser (noun)
an investigator who observes carefully	someone who conducts surveys of public opinion
a high ranking police officer	someone who examines votes at an election
	a petitioner who solicits contributions or trade or votes
	a person who takes or counts votes