stacker vs laborer

stacker and laborer both are nouns.

Word	Noun	Adjective	Verb	Adverb
stacker	Yes	No	No	No
laborer	Yes	No	No	No

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

stacker: a laborer who builds up a stack or pile
laborer: someone who works with their hands; someone engaged in manual labor

Other hypernyms of stacker include jack, labourer, manual laborer.

stacker (noun)	laborer (noun)
a laborer who builds up a stack or pile	someone who works with their hands; someone engaged in manual labor