Oakmark rhymes with:
pockmark, avmark, benchmark, bevmark, birthmark, bismarck, bismark, calmark, caremark, cellmark, chilmark, denmark, deutschemark, earmark, equimark, esmark, furmark, goldmark, hallmark, hashmark, hundertmark, landmark, lexmark, lindmark, lundmark, newmark, pathmark, pockmark, postmark, raymark, sanmark, southmark, torchmark, trademark, transmark, vandemark, vandermark, watermark, westmarc, westmark
Oakmark sounds like:
o'conner's, o'connor's, oconner's, oconnor's