wax / whacks 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. 👇
wax: (noun) any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water. (verb) cover with wax. (verb) go up or advance. (verb) increase in phase.
whacks: (noun) the sound made by a sharp swift blow. (verb) hit hard.
wax: w·AE·k·s
whacks: w·AE·k·s
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)