loaner / loner are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
loaner: (noun) a car that is lent as a replacement for one that is under repair.
loner: (noun) a person who avoids the company or assistance of others.
loaner: NA
loner: l·OW·n·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)