a person who rents a room or rooms to live in; lodger
roomer in American English
(ˈruːmər, ˈrumər)
noun
a person who lives in a rented room; lodger
Word origin
[1870–75, Amer.; room + -er1]This word is first recorded in the period 1870–75. Other words that entered Englishat around the same time include: Mafia, Victorian, linkage, onshore, washout-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)