proper vs fitting

proper is not a noun while fitting is a noun.

Word	Noun	Adjective	Verb	Adverb
proper	No	Yes	No	No
fitting	Yes	Yes	No	No

proper (noun)	fitting (noun)
	putting clothes on to see whether they fit
	a small and often standardized accessory to a larger system
	(usually in the plural) furnishings and equipment (especially for a ship or hotel)
	making or becoming suitable; adjusting to circumstances

proper (adjective)	fitting (adjective)
marked by suitability or rightness or appropriateness	being precisely fitting and right
appropriate for a condition or purpose or occasion or a person's character, needs	in harmony with the spirit of particular persons or occasion
having all the qualities typical of the thing specified
limited to the thing specified