say it: SAWR-tur
sorter is a noun meaning "a clerk who sorts things (as letters at the post office)". It carries 2 recorded senses.
a clerk who sorts things (as letters at the post office)
a machine for sorting things (such as punched cards or letters) into classes
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sorter come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.