Synonyms for Remainder:

n.

atlas, autobiography, biography, excess, whatever is left, surplus, remains, anthology, remaindered portion, fragment, Leavings, overplus, almanac, blook, bible, residual portion, annual, relic, bestseller, salvage, small piece, authority, overage, carryover. deal, barter, handle, deal with, traffic, trade, fence, deal in, receive. trash, garbage, e-waste, ruin, landfill, litter, junk, waste. aftermath (noun)
residual, end.
balance (noun)
residue, difference.
linkdef (noun)
residual, rest, residue, residuum.
oddment (noun)
oddment.
odds and ends (noun)
debris, leftovers, litter.
quantity (noun)
difference.
remainder (noun)
end, vestige, excess, dregs, remains, oddment, detritus, fragment, residuum, difference, waste, residual, relic, overplus, surplus, rest, scrap, Leavings, garbage, salvage, junk, residue, remnant.
remains (noun)
Leavings.
remnant (noun)
dross.
residue (noun)
Filings, sawdust, detritus, debris, grounds, leftovers, chaff, afterimage, scum, precipitate, dross, vestige, dregs, slag, afterglow, residue, remnant, sediment, artifact.
surfeit (noun)
overplus.

Other synonyms:

Leavings. excess. remains. hold over
carryover.
surplusage
surplus.
Other relevant words:
fragment, waste, residuum, residual, oddment, junk, difference, Leavings, ruin, excess, scrap, end, remains, rest, relic, overage, garbage, overplus, surplus, salvage.