halal vs proper

halal is a noun but proper is not a noun.

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

halal (noun)	proper (noun)
(Islam) meat from animals that have been slaughtered in the prescribed way according to the shariah

halal (adjective)	proper (adjective)
conforming to Muslim dietary laws	marked by suitability or rightness or appropriateness
proper or legitimate according to Muslim law	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