Spine
Part of speech: noun
Definition: A person or thing's backbone; the series of bones collectively from one's (literal or figurative) head to tail or pelvis. A rigid, pointed surface protuberance or needle-like structure on an animal, shell, or plant. Courage or assertiveness. The narrow, bound edge of a book.
Example sentence: I do quite like that Andrew Lloyd Webber song from 'Cats.' What's it called? 'Memory?' Sends shivers up your spine.
Backbone
Part of speech: noun
Definition: set of bones which connected make up the spine and spinal column and run down the middle of the back in vertebrate animals.any fundamental support, structure, or infrastructurecourage, fortitude, or strength
Example sentence: The backbone of surprise is fusing speed with secrecy.