There is a suffix marking plural (base realization /-sa/) on both nouns and pronouns. This suffix may change the stem of some nouns due to assimilation or historical devoicing; after vowels, a process of voicing and then rhotacism occurred, leaving /-ra/.

Nearly always, an -ím, -ot or -ain suffix denotes the plural form, but the stem is sometimes changed as well - consider lauth>leuthot (person>people) or the many examples of where diacritics must be introduced or removed upon the addition of the plural suffix.

Number marking is only obligatory for indefinite nouns; for definites, all that's used is verb marking.

A given noun is either inherently singular or inherently collective. The inverse number suffix, -lki, indicates that the noun has other than its inherent number: plural for singular, singulative for collective. This counts as a plural suffix for WALS purposes.