sandboy vs pitchman

sandboy and pitchman both are nouns.

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

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

sandboy: a young peddler of sand; used now only to express great happiness in `happy as a sandboy'
pitchman: someone who travels about selling his wares (as on the streets or at carnivals)

Other hypernyms of sandboy include hawker, packman, peddler, pedlar.

sandboy (noun)	pitchman (noun)
a young peddler of sand; used now only to express great happiness in `happy as a sandboy'	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