pilot cloth vs fabric

pilot cloth and fabric both are nouns.

Word	Noun	Adjective	Verb	Adverb
pilot cloth	Yes	No	No	No
fabric	Yes	No	No	No

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

pilot cloth: a thick blue cloth used to make overcoats and coats for sailors etc
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of pilot cloth include cloth, material, textile.

pilot cloth (noun)	fabric (noun)
a thick blue cloth used to make overcoats and coats for sailors etc	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
	the underlying structure