coal / cole / kohl 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. 👇
coal: (noun) fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period. (verb) supply with coal. (verb) take in coal.
cole: NA
kohl: (noun) a cosmetic preparation used by women in Egypt and Arabia to darken the edges of their eyelids.
coal: k·OW·l
cole: k·OW·l
kohl: k·OW·l
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)