linen vs fabric

linen and fabric both are nouns.

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

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

linen: a fabric woven with fibers from the flax plant
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of linen include cloth, material, textile.

linen (noun)	fabric (noun)
white goods or clothing made with linen cloth	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
a fabric woven with fibers from the flax plant	the underlying structure
a high-quality paper made of linen fibers or with a linen finish