working man vs stamper

working man and stamper both are nouns.

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

As nouns, stamper is a hyponym of working man; that is, stamper is a word with a more specific, narrower meaning than working man:

working man: an employee who performs manual or industrial labor
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 (noun)	stamper (noun)
an employee who performs manual or industrial labor	a power tool that stamps
	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)