Etymology
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ferrier (n.)
"ferryman," mid-15c., from ferry + -er (1).
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amphitheatre (n.)
chiefly British English spelling of amphitheater. See -er.
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ER 
abbreviation of emergency room, by 1965.
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nutter (n.)

late 15c., "one who gathers nuts," from nut + -er (1). Meaning "crazy person" is British slang, by 1958, from nut + -er (3). Nuttery "mental hospital" is attested in slang from 1931; earlier it meant "place for storing nuts" (1881).

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islander (n.)
"native or inhabitant of an island," 1540s, from island (n.) + -er (1).
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cooker (n.)

type of stove, 1868, from cook (v.) + -er (1).

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Christer (n.)
"overly-zealous Christian," 1910, originally sailors' slang, from Christ + -er (1).
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