drift vs driftage

drift and driftage both are nouns.

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

drift (noun)	driftage (noun)
a horizontal (or nearly horizontal) passageway in a mine	the deviation (by a vessel or aircraft) from its intended course due to drifting
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

drift (verb)	driftage (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