in vs fashionable

in is a noun but fashionable is not a noun.

Word	Noun	Adjective	Verb	Adverb
in	Yes	Yes	No	Yes
fashionable	No	Yes	No	No

in (noun)	fashionable (noun)
a unit of length equal to one twelfth of a foot

in (adjective)	fashionable (adjective)
currently fashionable	being or in accordance with current social fashions
directed or bound inward	having elegance or taste or refinement in manners or dress
holding office	popular and considered appealing or fashionable at the time

in (adverb)	fashionable (adverb)
to or toward the inside of