_Nom._ mōs genus honor
_Gen._ mōris generis honōris
_Dat._ mōrī generī honōrī
_Acc._ mōrem genus honōrem
_Voc._ mōs genus honor
_Abl._ mōre genere honōre

PLURAL.
_Nom._ mōrēs genera honōrēs
_Gen._ mōrum generum honōrum
_Dat._ mōribus generibus honōribus
_Acc._ mōrēs genera honōrēs
_Voc._ mōrēs genera honōrēs
_Abl._ mōribus generibus honōribus

1. Note that the final s of the stem becomes r (between vowels) in the
oblique cases. In many words (honor, color, and the like) the r of the
oblique cases has, by analogy, crept into the Nominative, displacing the
earlier s, though the forms honōs, colōs, etc., also occur, particularly in
early Latin and in poetry.

II. Ä­-Stems.

_A. Masculine and Feminine Ä­-Stems._

37. These regularly end in -is in the Nominative Singular, and always have
-ium in the Genitive Plural. Originally the Accusative Singular ended in
-im, the Ablative Singular in -Ä«, and the Accusative Plural in -Ä«s; but
these endings have been largely displaced by -em, -e, and -ēs, the endings
of Consonant-Stems.