filler vs tobacco

filler and tobacco both are nouns.

Word	Noun	Adjective	Verb	Adverb
filler	Yes	No	No	No
tobacco	Yes	No	No	No

As nouns, tobacco is a hypernym of filler; that is, tobacco is a word with a broader meaning than filler:

filler: the tobacco used to form the core of a cigar
tobacco: leaves of the tobacco plant dried and prepared for smoking or ingestion

Other hypernyms of filler include baccy.

filler (noun)	tobacco (noun)
the tobacco used to form the core of a cigar	leaves of the tobacco plant dried and prepared for smoking or ingestion
anything added to fill out a whole	aromatic annual or perennial herbs and shrubs
copy to fill space between more important articles in the layout of a magazine or newspaper
100 filler equal 1 forint in Hungary
used for filling cracks or holes in a surface