downdraft vs draught

downdraft and draught both are nouns.

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

As nouns, draught is a hypernym of downdraft; that is, draught is a word with a broader meaning than downdraft:

downdraft: a strong downward air current
draught: a current of air (usually coming into a chimney or room or vehicle)

Other hypernyms of downdraft include draft.

downdraft (noun)	draught (noun)
a strong downward air current	the act of moving a load by drawing or pulling
	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)

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