builder vs contractor

builder and contractor both are nouns.

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

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

builder: someone who contracts for and supervises construction (as of a building)
contractor: (law) a party to a contract

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

builder: someone who contracts for and supervises construction (as of a building)
contractor: someone (a person or firm) who contracts to build things

builder (noun)	contractor (noun)
someone who contracts for and supervises construction (as of a building)	a bodily organ that contracts
a person who creates a business or who organizes and develops a country	someone (a person or firm) who contracts to build things
a substance added to soaps or detergents to increase their cleansing action	(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