sponger vs working man

sponger and working man both are nouns.

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

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

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

sponger (noun)	working man (noun)
a follower who hangs around a host (without benefit to the host) in hope of gain or advantage	an employee who performs manual or industrial labor
a workman employed to collect sponges