Feature summary (what you would like to be able to do and where):

For any given word, it should be possible to find lexemes which have that word as a lemma or form, optionally limited to a particular language.

This is not currently possible because:

• The search does not have a way to limit searches by language (T271776).
• The search does not return reliable language information (T230833).
• The search returns all results containing the search string (e.g. searching for "a" returns 17,264 results).
• SPARQL queries are too slow (T167361).

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

When creating tools for adding lexemes, in order to avoid duplicate lexemes by checking whether one potentially already exists in that language. This is also needed in Wikidata itself: T195469

To create Wiktionary-style interfaces where the user can browse by word, e.g. T195411

Benefits (why should this be implemented?):

Duplicate lexemes can more easily be avoided. Editors spend less time manually searching for lexemes, and less time cleaning up duplicates created by other users.

More user-friendly interfaces can be created.