creak / creek 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. 👇
creak: (noun) a squeaking sound.
creek: (noun) any member of the Creek Confederacy (especially the Muskogee) formerly living in Georgia and Alabama but now chiefly in Oklahoma.
creak: k·r·IY·k
creek: k·r·IY·k
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)