haircloth vs fabric

haircloth and fabric both are nouns.

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

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

haircloth: cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of haircloth include cloth, material, textile.

haircloth (noun)	fabric (noun)
cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
	the underlying structure