apple vs eating apple

apple and eating apple both are nouns.

Word	Noun	Adjective	Verb	Adverb
apple	Yes	No	No	No
eating apple	Yes	No	No	No

As nouns, eating apple is a hyponym of apple; that is, eating apple is a word with a more specific, narrower meaning than apple:

apple: fruit with red or yellow or green skin and sweet to tart crisp whitish flesh
eating apple: an apple used primarily for eating raw without cooking

Other hyponyms of apple include crab apple, crabapple, dessert apple, cooking apple.

apple (noun)	eating apple (noun)
fruit with red or yellow or green skin and sweet to tart crisp whitish flesh	an apple used primarily for eating raw without cooking
native Eurasian tree widely cultivated in many varieties for its firm rounded edible fruits