vendor vs pitchman

vendor and pitchman both are nouns.

Word	Noun	Adjective	Verb	Adverb
vendor	Yes	No	No	No
pitchman	Yes	No	No	No

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

vendor: someone who promotes or exchanges goods or services for money
pitchman: someone who travels about selling his wares (as on the streets or at carnivals)

vendor (noun)	pitchman (noun)
someone who promotes or exchanges goods or services for money	someone who travels about selling his wares (as on the streets or at carnivals)
	an aggressive salesman who uses a fast line of talk to sell something