pea green vs yellow green

pea green and yellow green both are nouns.

Word	Noun	Adjective	Verb	Adverb
pea green	Yes	No	No	No
yellow green	Yes	No	No	No

As nouns, pea green and yellow green are synonyms defined as:

Other synonyms of pea green include chartreuse, Paris green, yellowish green.

pea green (noun)	yellow green (noun)
a shade of green tinged with yellow	a shade of green tinged with yellow