I love colloquialisms so I just ordered the audiobook of Landmarks by Robert McFarlane based on a recommendation with these examples from Robin Sloan:

ammil a Devon term for the fine film of silver ice that coats leaves, twigs, and grass when freeze follows thaw

This is something we see a lot in the American south and I am always enchanted by!

sìth “a fairy hill or mound,” is a knoll or hillock possessing the qualities which were thought to constitute desirable real estate for fairies — being well-drained, for instance, with a distinctive rise, and crowned by green grass.

As Robin says – the roots of Darth Vader there.

smeuse a Sussex dialect noun for “the gap in the base of a hedge made by the regular passage of a small animal.”

Dying to hear how this one is said. He recommends a paper copy for the glossary, but I really want to hear how these words are pronounced.