ativ SUFFIX
-ative; capable/worthy of;
testativ.us ADJ 1 1 NOM S M POS
testa, testae N (1st) F [XXXDX] lesser
object made from burnt clay; earthenware jar; fragment of earthenware, shard;
testum, testi N (2nd) N [XXXDX] lesser
testu, testus N (4th) N [XXXDX] lesser
earthenware pot/vessel (esp. placed as lid over food and heaped with coals);
testis, testis N (3rd) M [XBXCO]
testicle (usu. pl.);
testis, testis N (3rd) C [XXXBX]
witness;
iv SUFFIX
-ive, -ed; having the passive tendency; having been ...-ed;
testativ.us ADJ 1 1 NOM S M POS
testor, testari, testatus sum V (1st) DEP [XXXBX]
give as evidence; bear witness; make a will; swear; testify;

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.