a ship, railroad, freight car, etc. that transports or supplies coal
coaler in American English
(ˈkoulər)
noun
a railroad, ship, etc., used mainly to haul or supply coal
Word origin
[1865–70; coal + -er1]This word is first recorded in the period 1865–70. Other words that entered Englishat around the same time include: batting average, dunk, maverick, racism, tick-tack-toe-er is a suffix used in forming nouns designating persons from the object of their occupationor labor (hatter; tiler; tinner; moonshiner), or from their place of origin or abode (Icelander; southerner; villager), or designating either persons or things from some special characteristic or circumstance(six-footer; three-master; teetotaler; fiver; tenner)