sandboy vs packman

sandboy and packman both are nouns.

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

As nouns, packman is a hypernym of sandboy; that is, packman 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'
packman: someone who travels about selling his wares (as on the streets or at carnivals)

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

sandboy (noun)	packman (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)