shirttail vs fabric

shirttail and fabric both are nouns.

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

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

shirttail: fabric forming the tail of a shirt
fabric: artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers

Other hypernyms of shirttail include cloth, material, textile.

shirttail (noun)	fabric (noun)
fabric forming the tail of a shirt	artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
a brief addendum at the end of a newspaper article	the underlying structure