dost

As nouns the difference between cost and dost

is that cost is manner; way; means; available course; contrivance or cost can be amount of money, time, etc that is required or used or cost can be (obsolete) a rib; a side while dost is thirst.

As a verb cost

is to incur a charge; to require payment of a price.

As nouns the difference between most and dost

is that most is bridge (construction or natural feature that spans a divide) while dost is thirst.