buckram vs fabric

buckram and fabric both are nouns.

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

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

buckram: a coarse cotton fabric stiffened with glue; used in bookbinding and to stiffen clothing
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of buckram include cloth, material, textile.

buckram (noun)	fabric (noun)
a coarse cotton fabric stiffened with glue; used in bookbinding and to stiffen clothing	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
	the underlying structure

buckram (adjective)	fabric (adjective)
rigidly formal

buckram (verb)	fabric (verb)
stiffen with or as with buckram