Contraction of use and the suffix -er.
Category:English agent nouns
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From usare.
user
Category:French verbs
de:user et:user el:user fr:user ko:user io:user id:user it:user kk:user lt:user hu:user nl:user pl:user pt:user ru:user simple:user sr:user fi:user sv:user ta:user vi:user tr:user zh:user