landslide vs mudslide

landslide and mudslide both are nouns.

Word	Noun	Adjective	Verb	Adverb
landslide	Yes	No	No	No
mudslide	Yes	No	No	No

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

landslide: a slide of a large mass of dirt and rock down a mountain or cliff
mudslide: a landslide of mud

Other hyponyms of landslide include rockslide.

landslide (noun)	mudslide (noun)
a slide of a large mass of dirt and rock down a mountain or cliff	a landslide of mud
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