dust vs smudge

dust and smudge both are nouns.

Word	Noun	Adjective	Verb	Adverb
dust	Yes	No	Yes	No
smudge	Yes	No	Yes	No

As verbs, smudge is a hypernym of dust; that is, smudge is a word with a broader meaning than dust:

Other hypernyms of dust include blur, smear, smutch.

dust (noun)	smudge (noun)
fine powdery material such as dry earth or pollen that can be blown about in the air	a blemish made by dirt
the remains of something that has been destroyed or broken up	a smoky fire to drive away insects
free microscopic particles of solid material

dust (verb)	smudge (verb)
remove the dust from	make a smudge on; soil by smudging
distribute loosely
rub the dust over a surface so as to blur the outlines of a shape
cover with a light dusting of a substance