foreman vs straw boss

foreman and straw boss both are nouns.

Word	Noun	Adjective	Verb	Adverb
foreman	Yes	No	No	No
straw boss	Yes	No	No	No

As nouns, straw boss is a hyponym of foreman; that is, straw boss is a word with a more specific, narrower meaning than foreman:

Other hyponyms of foreman include baas, ganger, assistant foreman.

foreman (noun)	straw boss (noun)
a person who exercises control over workers	a member of a work gang who supervises the other workers
a man who is foreperson of a jury