hair / hare 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. 👇
hair: (noun) a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss. (noun) filamentous hairlike growth on a plant. (noun) any of the cylindrical filaments characteristically growing from the epidermis of a mammal. (noun) a filamentous projection or process on an organism.
hare: (noun) swift timid long-eared mammal larger than a rabbit having a divided upper lip and long hind legs; young born furred and with open eyes. (verb) run quickly, like a hare.
hair: hh·EH·r
hare: hh·EH·r
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)