flannel vs fabric

flannel and fabric both are nouns.

Word	Noun	Adjective	Verb	Adverb
flannel	Yes	No	No	No
fabric	Yes	No	No	No

As nouns, fabric is a hypernym of flannel; that is, fabric is a word with a broader meaning than flannel:

flannel: a soft light woolen fabric; used for clothing
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of flannel include cloth, material, textile.

flannel (noun)	fabric (noun)
a soft light woolen fabric; used for clothing	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
bath linen consisting of a piece of cloth used to wash the face and body	the underlying structure
(usually in the plural) trousers made of flannel or gabardine or tweed or white cloth