plus vs favourable

plus is a noun but favourable is not a noun.

Word	Noun	Adjective	Verb	Adverb
plus	Yes	Yes	No	No
favourable	No	Yes	No	No

plus (noun)	favourable (noun)
the arithmetic operation of summing; calculating the sum of two or more numbers
a useful or valuable quality

plus (adjective)	favourable (adjective)
on the positive side or higher end of a scale	(of winds or weather) tending to promote or facilitate
involving advantage or good	encouraging or approving or pleasing
	giving an advantage
	presaging or likely to bring good luck or a good outcome