yellowish green vs Paris green

yellowish green and Paris green both are nouns.

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

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

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

yellowish 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