"Rapa" is another name for the plant species called "rape". Perhaps, in some language, it also refers to the act with the same name.
By the way, currently you can list a plant in General as rapeseed but not as rape. Due to trademarks, you must not call it Canola.
Also, you cannot use the german word for tail, "schwanz", although tails and german are both common in SL.
Here's a funny one: You cannot abbreviate "nothing" as "nuttin" in a General listing.
... and I can't name something "cannibal", but I can name it "headhunter". I don't think simply naming something "cannibal" should make it adult, but I guess LL wants to play it safe.