A class plural suffix, identical to N. -ath (PE21/57). It is possible this suffix was also used as (and was perhaps inspired by) the Gnomish general plural suffix -th.
Noldorin
-ath
suffix. collective or group plural
Sindarin
-ath
suffix. collective or group plural
-ath
suffix. group plural embracing all things of the same name
-rim
suffix. collective or group plural
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
Doriathrin
-ath
noun. collective plural
Middle Primitive Elvish
-asta
suffix. collective plural
_pl.suff._group plural embracing all things of the same name, applied to things associated in some arrangement, or organization. >> elenath, ennorath, -rim