strong suit vs speciality

strong suit and speciality both are nouns.

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

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

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

strong suit (noun)	speciality (noun)
an asset of special worth or utility	the special line of work you have adopted as your career
a long suit including high cards	a distinguishing trait
	an asset of special worth or utility