Derivative nouns:
     e.g. pa˜, low.

     pa˜˜am, lowness, low land, depression.

     pa˜˜i, lying low, sleeping, sleeping place, house, place, temple.

     pa˜˜ai, that which is short and stocky, as a person or an           animal.

     Many verbal nouns figuratively denote cognate objects, and they are termed derivative Nouns or Verbal Derivatives by Dr. Caldwell.

     e.g. pƒdu (to sing)-pƒ——u, song.
         pe˜ (to desire, love)-pe–, a female person or animal.

     (Vinaiyƒla–aiyum Peyar) Participal Nouns.

     e.g. vanda+ƒn=vandƒn, he who came (pro.sfx.)
         vanda+avan=vandavan, Do. (dem. pron.)

     Of these two forms, the former, generally identified with the finite verb, can be used in all the three persons, and the latter, only in the third person.

     vand„n, I who came.
     vandƒy, thou who came.

     The ‘ƒn’ suffix of vandƒn is only a contraction of the ‘avan’ suffix of vandavan, and the ‘an’ suffix of the latter is the Masculine Singular Suffix, the shortened form of ƒn which is an alteration of ƒ–, a male person.

(1) Usage:
     Some imitative and onomatopoetic words have become verbs by usage.