option vs colouration

option and colouration both are nouns.

Word	Noun	Adjective	Verb	Adverb
option	Yes	No	No	No
colouration	Yes	No	No	No

As nouns, colouration is a hyponym of option; that is, colouration is a word with a more specific, narrower meaning than option:

option (noun)	colouration (noun)
the act of choosing or selecting	choice and use of colors (as by an artist)
one of a number of things from which only one can be chosen	appearance with regard to color
the right to buy or sell property at an agreed price; the right is purchased and if it is not exercised by a stated date the money is forfeited	the timbre of a musical sound