draught vs updraft

draught and updraft both are nouns.

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

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

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

Other hyponyms of draught include downdraft.

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

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