oars / ores 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. 👇
oars: (noun) an implement used to propel or steer a boat.
ores: (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.
oars: AO·r·z
ores: AO·r·z
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)