Plural of amassment: accumulations or collections of things gathered together; the act of amassing or gathering in large quantities.
From 'amass' (to gather/accumulate) + '-ment' (indicating an action or result). 'Amass' comes from Old French 'amasser,' from 'a-' (to) + 'masse' (mass/heap).
We don't usually use 'amassment'—we'd say 'accumulation' or 'collection'—but it perfectly captures the action of piling things up, from hoarder apartments to corporate wealth concentration, describing the physical and metaphorical act of heaping.
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