in fashion vs popular

in fashion and popular both are adjectives.

Word	Noun	Adjective	Verb	Adverb
in fashion	No	Yes	No	No
popular	No	Yes	No	No

in fashion (adjective)	popular (adjective)
popular and considered appealing or fashionable at the time	regarded with great favor, approval, or affection especially by the general public
	carried on by or for the people (or citizens) at large
	(of music or art) new and of general appeal (especially among young people)
	representing or appealing to or adapted for the benefit of the people at large