deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE

/subanta / सुबन्त

A /subanta or noun is whatever ends in a /sup.

So, the /pada —

**vidyut- विद्युत् + /am → vidyutam विद्युतम् " o lightning"

is a /sup-ender because it ends with /am.