Wikipedia reported on the word pussy, "Webster's Third International Dictionary point out similarities with the Old Norse, pūss (pocket); the Low German, pūse (vulva); and the Old English, pusa (bag), etc.; the medieval French word pucelle referred to a young adolescent girl. In the 17th century, the term was also used to refer to women in general." Interesting question, Jax, but, that's all I could find.

Didn't find anything on the word beaver.