fluorescent vs colourful

fluorescent is a noun but colourful is not a noun.

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

fluorescent (noun)	colourful (noun)
a lighting fixture that uses a fluorescent lamp

fluorescent (adjective)	colourful (adjective)
brilliantly colored and apparently giving off light	having much or varied color
emitting light during exposure to radiation from an external source	striking in variety and interest
	having color or a certain color; sometimes used in combination