(I like the summarized lists, BTW.)
Let's do some F-words:
ferrule, a metal band or ring that connects two parts, like the eraser and pencil, reinforces and prevents from splintering, like the brass tip on a walking stick, or binds, like the metal band on a paint brush.
fleuron, a flower-shaped ornamentation on buildings, coins, pastries, or in books as indications of a section break
fungible, being of such nature or kind as to be freely exchangeable or replaceable, in whole or in part, for another of like nature or kind. Pennies, cans of Campbell's tomato soup, and safety pins are fungible.
finial, the decorative topper at the apex or end of an object such as a lamp, curtain rod, or on a building or structure's pinnacle, peak of its roof, etc.
Maryn, who has many more