A person who makes films or movies; a filmmaker or cinematographer.
From 'film' with the agent suffix '-er,' creating a noun for someone who engages in filming, though 'filmmaker' is now the standard professional term.
'Filmer' sounds archaic now because the film industry standardized on 'filmmaker'—but it shows how '-er' was the original way English created occupational nouns before we got fancier suffixes.
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