rubbish vs dust

rubbish and dust both are nouns.

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

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

Other hyponyms of rubbish include scrap metal, debris, detritus, junk, rubble, litter.

rubbish (noun)	dust (noun)
nonsensical talk or writing	fine powdery material such as dry earth or pollen that can be blown about in the air
worthless material that is to be disposed of	the remains of something that has been destroyed or broken up
	free microscopic particles of solid material

rubbish (verb)	dust (verb)
attack strongly	remove the dust from
	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