roundsman vs workingman

roundsman and workingman both are nouns.

Word	Noun	Adjective	Verb	Adverb
roundsman	Yes	No	No	No
workingman	Yes	No	No	No

As nouns, workingman is a hypernym of roundsman; that is, workingman is a word with a broader meaning than roundsman:

roundsman: a workman employed to make rounds (to deliver goods or make inspections or so on)
workingman: an employee who performs manual or industrial labor

Other hypernyms of roundsman include working man, working person, workman.

roundsman (noun)	workingman (noun)
a workman employed to make rounds (to deliver goods or make inspections or so on)	an employee who performs manual or industrial labor