estate car vs station wagon

estate car and station wagon both are nouns.

Word	Noun	Adjective	Verb	Adverb
estate car	Yes	No	No	No
station wagon	Yes	No	No	No

As nouns, estate car and station wagon are synonyms defined as:

estate car and station wagon: a car that has a long body and rear door with space behind rear seat

Other synonyms of estate car include beach waggon, beach wagon, station waggon, waggon, wagon.

estate car (noun)	station wagon (noun)
a car that has a long body and rear door with space behind rear seat	a car that has a long body and rear door with space behind rear seat