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I don't know specifics here, but sometimes identical-looking tags are used for slightly different things (for example similar libraries in different languages). Is this the case here, or are they really synonymous?
From what I know of multi-tenant it's simply the adjective (and by far the more common term) for multi-tenancy. In my view they can be safely merged into multi-tenant. en.wikipedia.org/wiki/Multitenancy uses both terms as noun and adjective for the same concept.
I'd be inclined to synonymize to multi-tenancy. It's what the Wikipedia article calls it, and multi-tenant is probably popular because it was the first tag created.
– user102937
CommentedDec 13, 2012 at 19:12
Multi-tenant is a much more common term - started hearing it about a decade ago, whereas multi-tenancy only cropped up for me more recently. So I think multi-tenant is oldest because it's the earlier term, and still current.
