musculus vs contractor

musculus and contractor both are nouns.

Word	Noun	Adjective	Verb	Adverb
musculus	Yes	No	No	No
contractor	Yes	No	No	No

As nouns, contractor is a hypernym of musculus; that is, contractor is a word with a broader meaning than musculus:

Other hypernyms of musculus include contractile organ.

musculus (noun)	contractor (noun)
one of the contractile organs of the body	a bodily organ that contracts
	someone (a person or firm) who contracts to build things
	(law) a party to a contract
	the bridge player in contract bridge who wins the bidding and can declare which suit is to be trumps