deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
All nouns carry a /sup ending when they are actually used.
That ending comes from one of the seven groups of three of the list svaujasamauTch....
The case of the noun is the group number.
See also table of cases.
Examples.
The noun **RSINAm ऋषीणाम् "of seers" is made by adding /Am after **RSi- ऋषिॱ. As /Am is one of the three endings in the sixth group (/GasosAm), the word **RSINAm ऋषीणाम् is said to have a sixth ending. Western grammarians prefer to say that it has been put into the sixth case — same meaning.
**azvais अश्वैस् has third ending because kartRkaraN... pulled /bhis off the third row, then atobhisa::ais changed /bhis into ais ऐस्.
**khaTvayos खट्वयोस् has sixth ending when it means "of two mats", but seventh when it means "on two mats". In the former case the ending /os was pulled off the sixth row by rule SaSThIzeSe, in the latter off the seventh row by saptamyadhik....
**nadyAm नद्याम् "in a river" has seventh ending because rule saptamyadhik... pulled /Gi off the seventh line of the table, then GerAmnadyAmn... changed /Gi into Am आम्. Making it misleadingly sound as if it had /Am from the sixth line. But "of rivers", with /Am, is **nadInAm नदीनाम्.