minus vs unfavourable

minus is a noun but unfavourable is not a noun.

Word	Noun	Adjective	Verb	Adverb
minus	Yes	Yes	No	No
unfavourable	No	Yes	No	No

minus (noun)	unfavourable (noun)
an arithmetic operation in which the difference between two numbers is calculated

minus (adjective)	unfavourable (adjective)
on the negative side or lower end of a scale	(of winds or weather) tending to hinder or oppose
involving disadvantage or harm	not encouraging or approving or pleasing
	involving or creating circumstances detrimental to success or effectiveness