pitchman vs marketer

pitchman and marketer both are nouns.

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

As nouns, marketer is a hypernym of pitchman; that is, marketer is a word with a broader meaning than pitchman:

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

Other hypernyms of pitchman include seller, trafficker, vender, vendor.

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