One example from French.

La vase (femenine)= mud
Le vase (masculine) = vase

Earlier, much earlier, a post mentioned the troubles that anglos have learning French because of the gender issue. To highlight the fact that English is not the only language that makes no sense at times, I cite the following two examples:

Le féminisme (masculine) and la masculinité (feminine).

On a slightly off-topic note: One thing that annoys me is how perfectly good words with inherent gender are being dropped from common usage. I keep hearing various women being refered to as actors yet they strive to win the academy award for best actress.