polar / poler / poller 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. 👇
polar: (adjective) having a pair of equal and opposite charges. (adjective) located at or near or coming from the earth's poles. (adjective) of or existing at or near a geographical pole or within the Arctic or Antarctic Circles.
poler: NA
poller: NA
polar: p·OW·l·er
poler: NA
poller: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)