oar / or / ore 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. 👇
oar: (noun) an implement used to propel or steer a boat.
or: NA
ore: (noun) a mineral that contains metal that is valuable enough to be mined. (noun) a monetary subunit in Denmark and Norway and Sweden; 100 ore equal 1 krona.
oar: AO·r
or: AO·r
ore: AO·r
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)