contractor vs musculus

contractor and musculus both are nouns.

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

As nouns, musculus is a hyponym of contractor; that is, musculus is a word with a more specific, narrower meaning than contractor:

Other hyponyms of contractor include muscle.

contractor (noun)	musculus (noun)
a bodily organ that contracts	one of the contractile organs of the body
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