spine vs quill

spine and quill both are nouns.

Word	Noun	Adjective	Verb	Adverb
spine	Yes	No	No	No
quill	Yes	No	No	No

As nouns, quill is a hyponym of spine; that is, quill is a word with a more specific, narrower meaning than spine:

spine: a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin
quill: a stiff hollow protective spine on a porcupine or hedgehog

Other hyponyms of spine include ray.

spine (noun)	quill (noun)
a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin	a stiff hollow protective spine on a porcupine or hedgehog
the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved	the hollow spine of a feather
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord	any of the larger wing or tail feathers of a bird
a small sharp-pointed tip resembling a spike on a stem or leaf	pen made from a bird's feather
any sharply pointed projection

Difference between spine and quill

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