lemon yellow vs gamboge

lemon yellow and gamboge both are nouns.

Word	Noun	Adjective	Verb	Adverb
lemon yellow	Yes	No	No	No
gamboge	Yes	No	No	No

As nouns, lemon yellow and gamboge are synonyms defined as:

Other synonyms of lemon yellow include lemon, maize.

lemon yellow (noun)	gamboge (noun)
a strong yellow color	a strong yellow color
	a gum resin used as a yellow pigment and a purgative