What's the difference between thill and underclay?
Thill
Definition:
(n.) One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft.
(n.) The floor of a coal mine.
Example Sentences:
(1) It is obvious that in the treatment of this disease, as in any other that is chronic and of an uncertain prognosis, although generally fatal, there thill be a series of emotional factors that cause abrupt changes in all aspects of life in these patients, since they are constantly facing death.
(2) Thill said deputies walked the streets with bullhorns and knocked on doors overnight to warn residents of the danger.
(3) On Sunday, Forest Service spokeswoman Cindy Thill said officials expected the fire to have grown considerably since Saturday night.
Underclay
Definition:
(n.) A stratum of clay lying beneath a coal bed, often containing the roots of coal plants, especially the Stigmaria.