avalanche

nouns

a slide of large masses of snow and ice and mud down a mountain
avalanche
is a type of (narrower)
(geology) the descent of a large mass of earth or rocks or snow etc.
slide
a sudden appearance of an overwhelming number of things
"the program brought an avalanche of mail"
avalanche
is a type of (narrower)
an event that happens
happening, natural event, occurrence, occurrent

verbs

gather into a huge mass and roll down a mountain, of snow
avalanche, roll down