Karp is the lexical search system of Språkbanken. The graphical interface of Karp is found here.
If you would like to learn how to use Karp, you can find exercises in Swedish here.
Lars Borin, Markus Forsberg, Leif-Jöran Olsson, and Jonatan Uppström. 2012.
The open lexical infrastructure of Språkbanken. Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12). Istanbul: ELRA, pages 3598–3602.