windstorm vs dust storm

windstorm and dust storm both are nouns.

Word	Noun	Adjective	Verb	Adverb
windstorm	Yes	No	No	No
dust storm	Yes	No	No	No

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

Other hyponyms of windstorm include cyclone, duster, sandstorm, sirocco, tempest, whirlwind.

windstorm (noun)	dust storm (noun)
a storm consisting of violent winds	a windstorm that lifts up clouds of dust or sand