interplanetary dust vs dust

interplanetary dust and dust both are nouns.

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

As nouns, dust is a hypernym of interplanetary dust; that is, dust is a word with a broader meaning than interplanetary dust:

interplanetary dust (noun)	dust (noun)
microscopic particles in the interplanetary medium	fine powdery material such as dry earth or pollen that can be blown about in the air
	the remains of something that has been destroyed or broken up
	free microscopic particles of solid material

interplanetary dust (verb)	dust (verb)
	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