colourless vs pale

colourless is not a noun while pale is a noun.

Word	Noun	Adjective	Verb	Adverb
colourless	No	Yes	No	No
pale	Yes	Yes	Yes	No

colourless (noun)	pale (noun)
	a wooden strip forming part of a fence

colourless (adjective)	pale (adjective)
weak in color; not colorful	abnormally deficient in color as suggesting physical or emotional distress
lacking in variety and interest	lacking in vitality or interest or effectiveness
	very light colored; highly diluted with white
	not full or rich
	(of light) lacking in intensity or brightness; dim or feeble

colourless (verb)	pale (verb)
	turn pale, as if in fear