greenish vs dark-green

greenish and dark-green both are adjectives.

Word	Noun	Adjective	Verb	Adverb
greenish	No	Yes	No	No
dark-green	No	Yes	No	No

As adjectives, greenish and dark-green are synonyms defined as:

greenish and dark-green: of the color between blue and yellow in the color spectrum; similar to the color of fresh grass

Other synonyms of greenish include green, light-green.

greenish (adjective)	dark-green (adjective)
of the color between blue and yellow in the color spectrum; similar to the color of fresh grass	of the color between blue and yellow in the color spectrum; similar to the color of fresh grass