green apple aphid vs apple aphid

green apple aphid and apple aphid both are nouns.

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

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

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

Other synonyms of green apple aphid include Aphis pomi.

green apple aphid (noun)	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