woollen vs fabric

woollen and fabric both are nouns.

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

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

woollen: a fabric made from the hair of sheep
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of woollen include cloth, material, textile.

woollen (noun)	fabric (noun)
a fabric made from the hair of sheep	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
	the underlying structure

woollen (adjective)	fabric (adjective)
of or related to or made of wool