崩壊【ほうかい】
collapse, crumbling, breaking down, caving in, (radioactive) decay, disintegration
崩れる【くずれる】
to collapse, to crumble, to get out of shape, to lose one's shape, to become disorganized, to become untidy, to break down, to be thrown into disarray, to crash (stock market), to slump, to decline, to break money into small change, to turn bad (e.g. weather), to change for the worse, to deteriorate
雪崩【なだれ】
avalanche, snowslide
崩す【くずす】
to destroy, to demolish, to pull down, to tear down, to level, to disturb, to put into disorder, to throw off balance, to make shaky, to relax (one's pose), to make oneself at ease, to break (a bill), to change, to make change, to write in cursive style, to write in running style, to break into a smile, to let off a smile, to lower (a price)
切り崩す【きりくずす】
to level (earth), to cut through (a mountain), to split (the opposition), to break (strike)
山崩れ【やまくずれ】
landslide