a person or thing that fills

a filler for pies; a filler of orders.

a thing or substance used to fill a gap, cavity, or the like.

a substance used to fill cracks, pores, etc., in a surface before painting or varnishing.

a liquid, paste, or the like used to coat a surface or to give solidity, bulk, etc., to a substance, as paper or a chemical powder.

Journalism . material, considered of secondary importance, used to fill out a column or page.

an implement used in filling, as a funnel.

cotton, down, or other material used to stuff or pad an object, as a quilt or cloth toy.

material placed between the insole and the exterior sole of a shoe.

Linguistics . (esp. in tagmemics) one of a class of items that can fit into a given slot in a construction.

Building Trades . a plate, slab, block, etc., inserted between two parallel members to connect them.

the tobacco forming the body of a cigar.

metal in the form of a rod or wire, used in brazing, welding, and soldering.