subcontractor vs contractor

subcontractor and contractor both are nouns.

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

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

subcontractor: someone who enters into a subcontract with the primary contractor
contractor: someone (a person or firm) who contracts to build things

subcontractor (noun)	contractor (noun)
someone who enters into a subcontract with the primary contractor	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