Here are some more fascinating words.
Obelisk. Those tall pointy structures of which the Washington Monument is one
Anile. The aging phenomenon in women... called "senile" in men.
Estivation. A summer sleep of animals to escape the heat. The opposite of Hibernation, a winter period of suspended animation.
(LOL...the spell check objected to anile and estivation.. too unusual for it, I guess.)