favourable vs preferential

favourable and preferential both are adjectives.

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

favourable (adjective)	preferential (adjective)
(of winds or weather) tending to promote or facilitate	manifesting partiality
encouraging or approving or pleasing
giving an advantage
presaging or likely to bring good luck or a good outcome