I'm taking an introductory linguistics class and we're talking about language change at the moment. It got me thinking about etymologies - they're basically documented changes of words. I was wondering if words that are related change together as a group. So do all family words (mother, father, sister) or animal words, or food, emotions, etc., change in tandem? Do you know of any words that changed together like this?
Also, what's one of your favorite etymologies, even folk ones? I love learning everyday words' origins. :)