accumulation

agglomerate, assortment, congeries, conglomerate, conglomeration, hodgepodge, hotchpotch, jumble, medley, mélange, mishmash, mix, mixture, motley, potpourri

agglomeration, clutter, hash, heap, litter, mass, pile

aggregate, aggregation, sum, totality

backlog, cache, fund, hoard, inventory, kitty, nest egg, reserve, stock, stockpile, store, supply

doubling, quadrupling, tripling

creep, growth, rise, spread

enlargement, escalation, expansion

amplification, distension (or distention), inflation

accretion, accrual, augmentation, cumulation

extension, lengthening

boost, gain, hike, increment, rise