turtle soup vs green turtle soup

turtle soup and green turtle soup both are nouns.

Word	Noun	Adjective	Verb	Adverb
turtle soup	Yes	No	No	No
green turtle soup	Yes	No	No	No

As nouns, turtle soup and green turtle soup are synonyms defined as:

turtle soup and green turtle soup: soup usually made of the flesh of green turtles

turtle soup (noun)	green turtle soup (noun)
soup usually made of the flesh of green turtles	soup usually made of the flesh of green turtles