Here's a little used word, or at least, one I don't use often: mantle. Or mantel for that matter.
One is a shelf over a fireplace.
I have a gas stove, so no mantel for me.
The other mantle actually has several definitions:
It can be a loose, sleeveless cape
It can be something that covers, envelopes, or conceals - the mantle of darkness
It can be the section of earth between the crust and the core
It has several scientific uses - in zoology, metallurgy, ornithology
And, if you are so inclined, you could also think of Mickey Mantle.
But one thing I remember - or maybe haunts me - is from my high school Latin class. I translating something and having the hardest time figuring out what a mantle was...it didn't make sense in the story I was working on.
But a specialized use of mantle I remember from family campouts. I remember being admonished to be careful with the mantle for the Coleman lantern.