hatchback door vs liftgate

hatchback door and liftgate both are nouns.

Word	Noun	Adjective	Verb	Adverb
hatchback door	Yes	No	No	No
liftgate	Yes	No	No	No

As nouns, hatchback door and liftgate are synonyms defined as:

hatchback door and liftgate: a sloping rear car door that is lifted to open

Other synonyms of hatchback door include hatch, hatchback.

hatchback door (noun)	liftgate (noun)
a sloping rear car door that is lifted to open	a sloping rear car door that is lifted to open