volume vs backbone

volume and backbone both are nouns.

Word	Noun	Adjective	Verb	Adverb
volume	Yes	No	No	No
backbone	Yes	No	No	No

volume (noun)	backbone (noun)
physical objects consisting of a number of pages bound together	the part of a network that connects other networks together
the magnitude of sound (usually in a specified direction)	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 property of something that is great in magnitude	fortitude and determination
a publication that is one of a set of several similar publications	the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
the amount of 3-dimensional space occupied by an object	a central cohesive source of support and stability
a relative amount