aggregation, collection, accumulation, assemblage - several things grouped together or considered as a whole

firewood - wood used for fuel; "they collected and cut their own firewood"

Yule log - large log traditionally burned at Christmas

accumulation - (finance) profits that are not paid out as dividends but are added to the capital base of the corporation

bank - a supply or stock held in reserve for future use (especially in emergencies)

fuel level - the amount of fuel remaining

reserve account, reserve fund - funds taken out of earnings to provide for anticipated future payments

amass, conglomerate, cumulate, pile up, accumulate, gather - collect or gather; "Journals are accumulating in my office"; "The work keeps piling up"