gas guzzler vs motorcar

gas guzzler and motorcar both are nouns.

Word	Noun	Adjective	Verb	Adverb
gas guzzler	Yes	No	No	No
motorcar	Yes	No	No	No

As nouns, motorcar is a hypernym of gas guzzler; that is, motorcar is a word with a broader meaning than gas guzzler:

gas guzzler: a car with relatively low fuel efficiency
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of gas guzzler include auto, automobile, car, machine.

gas guzzler (noun)	motorcar (noun)
a car with relatively low fuel efficiency	a motor vehicle with four wheels; usually propelled by an internal combustion engine