tobacco vs filler

tobacco and filler both are nouns.

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

As nouns, filler is a hyponym of tobacco; that is, filler is a word with a more specific, narrower meaning than tobacco:

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

Other hyponyms of tobacco include roll of tobacco, smoke, smoking mixture, snuff, shag, Turkish tobacco.

tobacco (noun)	filler (noun)
leaves of the tobacco plant dried and prepared for smoking or ingestion	the tobacco used to form the core of a cigar
aromatic annual or perennial herbs and shrubs	anything added to fill out a whole
	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