dosage vs draught

dosage and draught both are nouns.

Word	Noun	Adjective	Verb	Adverb
dosage	Yes	No	No	No
draught	Yes	No	Yes	No

As nouns, draught is a hyponym of dosage; that is, draught is a word with a more specific, narrower meaning than dosage:

dosage (noun)	draught (noun)
a measured portion of medicine taken at any one time	the act of moving a load by drawing or pulling
the quantity of an active agent (substance or radiation) taken in or absorbed at any one time	a large and hurried swallow
	a dose of liquid medicine
	the depth of a vessel's keel below the surface (especially when loaded)
	a serving of drink (usually alcoholic) drawn from a keg
	a current of air (usually coming into a chimney or room or vehicle)

dosage (verb)	draught (verb)
	make a blueprint of