fitting vs proper

fitting is a noun but proper is not a noun.

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

fitting (noun)	proper (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

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