stamper vs working man

stamper and working man both are nouns.

Word	Noun	Adjective	Verb	Adverb
stamper	Yes	No	No	No
working man	Yes	No	No	No

As nouns, working man is a hypernym of stamper; that is, working man is a word with a broader meaning than stamper:

stamper: a workman whose job is to form or cut out by applying a mold or die (either by hand or by operating a stamping machine)
working man: an employee who performs manual or industrial labor

Other hypernyms of stamper include working person, workingman, workman.

stamper (noun)	working man (noun)
a power tool that stamps	an employee who performs manual or industrial labor
someone who walks with a heavy noisy gait or who stamps on the ground
a workman whose job is to form or cut out by applying a mold or die (either by hand or by operating a stamping machine)