Originally Posted By: The Pook
boatswain (bosun); rowlock (rollock);

I've always wondered why we have bosun but not coxsun (coxun?).
Rowlock is "pronounced" oarlock in the US, but do you mean rollock more like ralick? I'm not sure from your spelling what is meant. In my speech, I can barely distinguish between row lock, rollock, and roll lock.