Special:MergeLexemes does not show up in the list of Special Pages at Special:SpecialPages. It should so experienced editors can find it in the place they expect it. Special:MergeItems is listed in the Wikibase section.
GIVEN a Wikibase Lexeme installation
THEN Special:MergeLexemes show up in the Wikibase section
AND the link text says "Merge two Lexemes"
- The Special Page shows up in the listing.