In this sentence there are sixteen words, eighty-one letters, one hyphen, four commas, and one period.

apodyopsis
n. the act of imagining a person naked

shunpike
n. a side road taken to avoid turnpike tolls or traffic

(Thanks, David.)

martext
n. a blundering preacher

Devised by Lee Sallows, each of these lists inventories its own contents:

• fifteen e’s, seven f’s, four g’s, six h’s, eight i’s, four n’s, five o’s, six r’s, eighteen s’s, eight t’s, four u’s, three v’s, two w’s, three x’s
• sixteen e’s, five f’s, three g’s, six h’s, nine i’s, five n’s, four o’s, six r’s, eighteen s’s, eight t’s, three u’s, three v’s, two w’s, four x’s

potvaliant
adj. inclined to fight when drunk