fireman vs manual laborer

fireman and manual laborer both are nouns.

Word	Noun	Adjective	Verb	Adverb
fireman	Yes	No	No	No
manual laborer	Yes	No	No	No

As nouns, manual laborer is a hypernym of fireman; that is, manual laborer is a word with a broader meaning than fireman:

fireman: a laborer who tends fires (as on a coal-fired train or steamship)
manual laborer: someone who works with their hands; someone engaged in manual labor

Other hypernyms of fireman include jack, laborer, labourer.

fireman (noun)	manual laborer (noun)
play in which children pretend to put out a fire	someone who works with their hands; someone engaged in manual labor
a member of a fire department who tries to extinguish fires
a laborer who tends fires (as on a coal-fired train or steamship)
a pitcher who does not start the game