UNIQUE WORDS game to increase our vocabulary - alphabetical order

Martinet - a strict disciplinarian, especially in the armed forces.
"the woman in charge was a martinet who treated all those beneath her like children"

QUADRAGESIMAL - adjective, ARCHAIC
(of a fast, especially one in Lent) lasting forty days.
belonging or appropriate to the period of Lent.

Tontine - 

an annuity shared by subscribers to a loan or common fund, the shares increasing as subscribers die until the last survivor enjoys the whole income

• a scheme for life insurance in which the beneficiaries are those who survive and maintain a policy to the end of a given period

warren
a series of underground tunnels occupied by rabbits

Their entrances were cunningly contrived to look like rabbit holes, so that strangers might think they led to nothing more than some sandy warren. 
Gask, Lilian

yokel
a person who is not intelligent or interested in culture