The affix ṣvun (ak) comes after a verb when the agent so expressed denotes an artist.,
Vart:- This affix should be confined to the verbs नृत् 'to dance', खन् 'to dig' and रञ्ज 'to dye'.
Thus नृत् + ष्वुन् = नर्त + अक (VII. I. I) = नर्तकः 'dancer'. The letter व is indicatory (I .3. 6) and by Rule (IV. I. 4I), it denotes that words formed by prefixes having indicatory च् form their feminine gender by the affix ङीप्. Thus the feminine of नर्तक is नर्तकी; so also खनकः 'miner', fem. खनकी; रजकः 'washer-man', fem. रजकी.
In the case of the root रञ्ज the nasal is elided. According to the opinion of the author of Mahabhashya, only two verbs are governed by this sutra namely नृत् and खन् . According to him, the verb रञ्ज takes the affix क्वुन्. Thus रञ्ज + क्वुन् = रज् + यु 6.4.37 = रज् +अक (VII. I. I) = रजकः, feminine रजिका.,