pea green vs Paris green

pea green and Paris green both are nouns.

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

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

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

pea green (noun)	Paris green (noun)
a shade of green tinged with yellow	a shade of green tinged with yellow
	a toxic double salt of copper arsenate and copper acetate