gay vs colourful

gay is a noun but colourful is not a noun.

Word	Noun	Adjective	Verb	Adverb
gay	Yes	Yes	No	No
colourful	No	Yes	No	No

gay (noun)	colourful (noun)
someone who is sexually attracted to persons of the same sex

gay (adjective)	colourful (adjective)
bright and pleasant; promoting a feeling of cheer	having much or varied color
brightly colored and showy	striking in variety and interest
homosexual or arousing homosexual desires	having color or a certain color; sometimes used in combination
given to social pleasures often including dissipation
offering fun and gaiety
full of or showing high-spirited merriment