It sounds like we will make a synonym then. However, the convention seems to be using plural forms of nouns in tag names, in which case I guess we would remove all block-design tags, and create the synonym block-designs $\to$ combinatorial-designs, to keep with that convention. (I can't decide if I should suggest this in an answer, or just keep the conversation under this post) — pjs36 Mar 31 at 1:24

@psj36 I agree that this is a reasonable synonym. I'll give it some more time but intend to implement the proposed action(s) rather soon. (Including the plural, though I am personally not a fan of this; but yeah, it's tradition here like this and a relatively harmless one at that although [rant suppressed] ;-) — quid ♦ Mar 31 at 15:38