apple aphid vs green apple aphid

apple aphid and green apple aphid both are nouns.

Word	Noun	Adjective	Verb	Adverb
apple aphid	Yes	No	No	No
green apple aphid	Yes	No	No	No

As nouns, apple aphid and green apple aphid are synonyms defined as:

apple aphid and green apple aphid: bright green aphid; feeds on and causes curling of apple leaves

Other synonyms of apple aphid include Aphis pomi.

apple aphid (noun)	green apple aphid (noun)
bright green aphid; feeds on and causes curling of apple leaves	bright green aphid; feeds on and causes curling of apple leaves