Fuel for a fire

Wood, peat, coal... something intended for building a fire.


Believe

Believe, believed, believing, believer, belief.

Names of Nations

A song that names a country/nation/republic/kingdom (current or defunct), but don't quote this song:


Yakko's World——source

Feel free to play that to get ideas, though.
(If anyone is at work where videos are blocked, it's Yakko Warner sings the Nations of the World, from Animaniacs.)

Horses

Word or category; any term for a horse, so "pony" and "steed" and "stallion" and all can be played.


Trees

Category. Either the word "tree" or the more specific name of a type of tree.


Trees on a sand dune in Duluth. The fence in the foreground is buried in sand. Lake Superior's over the hill.