road builder vs constructor

road builder and constructor both are nouns.

Word	Noun	Adjective	Verb	Adverb
road builder	Yes	No	No	No
constructor	Yes	No	No	No

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

road builder: someone whose business is to build roads
constructor: someone who contracts for and supervises construction (as of a building)

Other hypernyms of road builder include builder.

road builder (noun)	constructor (noun)
someone whose business is to build roads	someone who contracts for and supervises construction (as of a building)