klingon_grammar1-7  Exercise 2: Doer Nouns With -wI'
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  "one who eats"         Sop + wI'     ->  SopwI'      plural: SopwI'pu'
  "one who finds"        Sam + wI'     ->  SamwI'      plural: SamwI'pu'
  "one who understands"  yaj + wI'     ->  yajwI'      plural: yajwI'pu'

The plural is -pu' because each noun names a being who can use language
(Chapter 3).

Esperanto "one who eats": manĝanto (manĝ- + -anto). Esperanto's -anto and
Klingon's -wI' do the same job.

(Hungarian does it too: eszik -> evő, "one who eats".)