strong suit vs long suit

strong suit and long suit both are nouns.

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

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

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

As nouns, long suit is a hypernym of strong suit; that is, long suit is a word with a broader meaning than strong suit:

strong suit (noun)	long suit (noun)
an asset of special worth or utility	an asset of special worth or utility
a long suit including high cards	in a hand, the suit having the most cards