estate car vs motorcar

estate car and motorcar both are nouns.

Word	Noun	Adjective	Verb	Adverb
estate car	Yes	No	No	No
motorcar	Yes	No	No	No

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

estate car: a car that has a long body and rear door with space behind rear seat
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of estate car include auto, automobile, car, machine.

estate car (noun)	motorcar (noun)
a car that has a long body and rear door with space behind rear seat	a motor vehicle with four wheels; usually propelled by an internal combustion engine