housebuilder vs builder

housebuilder and builder both are nouns.

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

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

housebuilder: someone who builds houses as a business
builder: someone who contracts for and supervises construction (as of a building)

Other hypernyms of housebuilder include constructor.

housebuilder (noun)	builder (noun)
someone who builds houses as a business	someone who contracts for and supervises construction (as of a building)
	a person who creates a business or who organizes and develops a country
	a substance added to soaps or detergents to increase their cleansing action