driftage vs drift

driftage and drift both are nouns.

Word	Noun	Adjective	Verb	Adverb
driftage	Yes	No	No	No
drift	Yes	No	Yes	No

driftage (noun)	drift (noun)
the deviation (by a vessel or aircraft) from its intended course due to drifting	a horizontal (or nearly horizontal) passageway in a mine
	the pervading meaning or tenor
	a general tendency to change (as of opinion)
	a large mass of material that is heaped up by the wind or by water currents
	a force that moves something along
	the gradual departure from an intended course due to external influences (as a ship or plane)
	a process of linguistic change over a period of time

driftage (verb)	drift (verb)
	be piled up in banks or heaps by the force of wind or a current
	be subject to fluctuation
	drive slowly and far afield for grazing
	move about aimlessly or without any destination, often in search of food or employment
	be in motion due to some air or water current
	wander from a direct course or at random
	move in an unhurried fashion
	cause to be carried by a current
	live unhurriedly, irresponsibly, or freely
	vary or move from a fixed point or course