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The Oxford Dictionary website states that speciality can be used as a modifier. (I think this is the same as an adjective - am I wrong?)I'd also confirm the US/UK English split as to the spelling.
Ti: I've never heard of a speciality store which sounds very American to my ears, so I'd actually expect the US spelling to be used with that! Anyway, have you a link to a site which confirms adjectival use? I ask because I've never seen it as an adjective, and neither Collins online nor my ODE which are my go-to sources define the word -- in either spelling -- as an adjective, only as nouns. Though both mention its use as a modifier, which might easily be confused with an adjective (certainly by me!) eg in the ODE "speciality potatoes for salads" meaning meeting particular tastes or needs.
I've looked at a few dictionaries (Oxford, Cambridge and Merriam-Webster) and none of them define specialty as an adjective or modifier. However, I wouldn't blink at that usage either.I would have said, without looking, that specialty could be used in the same capacity as speciality, since they are the same word, really. I wouldn't blink at a "specialty store" or equivalent. Specialty tools, etc. Of course, now that I've typed it a few times, it looks all wrong.