filler has 1 distinct synonym spread across 1 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
used for filling cracks or holes in a surface
100 filler equal 1 forint in Hungary
Synonyms, antonyms and the broader and narrower relations for filler come from Princeton University’s WordNet. Full sources and licences.
copy to fill space between more important articles in the layout of a magazine or newspaper
anything added to fill out a whole
“some of the items in the collection are mere makeweights”
the tobacco used to form the core of a cigar