exertion

As a noun exertion

is an expenditure of physical or mental effort.

As an adjective roadworn is

worn out by long travel on roads, or in a damaged or depleted state due to constant or prolonged usage or exertion.

As nouns the difference between exertion and oncome

is that exertion is an expenditure of physical or mental effort while oncome is advent, arrival, approach; onset.

As a verb oncome is

(rare) to arrive; come to; come on.