long suit vs specialty

long suit and specialty both are nouns.

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

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

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

long suit (noun)	specialty (noun)
an asset of special worth or utility	the special line of work you have adopted as your career
in a hand, the suit having the most cards	a distinguishing trait
	an asset of special worth or utility