metier vs long suit

metier and long suit both are nouns.

Word	Noun	Adjective	Verb	Adverb
metier	Yes	No	No	No
long suit	Yes	No	No	No

As nouns, metier and long suit are synonyms defined as:

Other synonyms of metier include forte, speciality, specialty, strength, strong point, strong suit.

metier (noun)	long suit (noun)
an occupation for which you are especially well suited	an asset of special worth or utility
an asset of special worth or utility	in a hand, the suit having the most cards