muoter || –|- ! Genitive|| fater || – || fateres || –es || fatero || –o || fatero || –o|| muoter || – || muotero || –o|- ! Dative|| fater || – || fatere || –e || faterum || –um || faterun (-on) || –un (–on)|| muoter || – || muoterum (-un, -on) || –um (–un, –on)|}fater "father" has moved to the a-declension later on, and even in early documents the nominative and accusative plural has borrowed -ā (-a) from the a-stems.muoter "mother" preserves the original declension, unmixed with a-stem forms. The other members of this class follow the same declension: bruoder "brother", tohter "daughter", and swëster "sister". The -nd declension {| class="wikitable" ! rowspan="3" | ! colspan="6" | friunt; friunt, friuntā (-a) friend m.|- ! rowspan="2" colspan="2" | Singular! colspan="4" | Plural|- ! colspan="2" | Early! colspan="2" | Late|- ! Nominative, Accusative|| friunt || – || friunt || – || friuntā (-a) || –ā (–a)|- ! Genitive|| friuntes || –es || friunto || –o || friunto || –o|- ! Dative|| friunte || –e || friuntum || –um || friuntun (-on) || –un (–on)|} This declension has almost entirely merged with the a-declension. Only in early texts do the nominative and accusative plural have a separate, endingless form. A large number of nouns belong to this declension, such as fīant "enemy", wīgant "warrior", and many others in -ant. The -z declension This class consists of neuter nouns and corresponds to Greek neuters in -os and Latin neuters in -us (genitive -eris, -oris). Formally, these nouns look like regular neuters except that a suffix -ir (from Proto-Germanic -iz-, from Proto-Indo-European -es-) is added to the stem in the plural and triggers umlaut. This class was massively expanded in Middle and Modern High German. {| class="wikitable" ! rowspan="3" | ! colspan="6" | lamb; lembir lamb n.|- ! rowspan="2" colspan="2" | Singular! colspan="4" | Plural|- ! colspan="2" | Early! colspan="2" | Late|- ! Nominative, Accusative|| lamb || – || lembir || –ir || lembir || –ir|- ! Genitive|| lambes || –es || lembiro || –iro || lembiro || –iro|- ! Dative|| lambe || –e || lembirum (-irom) || –irum (–irom) || lembirun (-iron) || –irun (–iron)|- ! Instrumental|| lambu (-o) || –u (–o) || -- || -- || -- || -- |} A small number of nouns were declined according to this declension, among them lamb "lamb", kalb "calf", blat "leaf", and grab