boar / boer / bore 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. 👇
boar: (noun) an uncastrated male hog.
boer: NA
bore: (noun) a person who evokes boredom. (noun) diameter of a tube or gun barrel. (noun) a hole or passage made by a drill; usually made for exploratory purposes. (verb) cause to be bored. (verb) make a hole, especially with a pointed power or hand tool.
boar: b·AO·r
boer: b·AO·r
bore: b·AO·r
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)