63. In neuter nouns with liquid or nasal stems the nominative is the same as the stem.

Exceptions:

1. Stems in in- have e instead of i in the nominative, as in nōmen (stem nōmin-).
2. Most stems in er- and or- have -us in the nominative.
   

   genus, stem gener-¹

64. Nouns of this class are declined as follows.

So also are declined

opus, -eris  work
pīgnus, -eris or -oris  pledge, etc.

Note— The following real or apparent liquid and nasal stems have the Genitive plural in -ium, and are to be classed with the i-stems:

imber, linter, ūter, venter; glīs, mās, mūs, [† rēn]

Also vīrēs (plural of vīs: see § 79).

Footnotes