Both 'shelve' and 'shelf' are correct English words, but they serve completely different grammatical functions and cannot be used interchangeably in written or spoken sentences. 'Shelf' is a noun referring to the physical flat storage board itself (with the irregular plural being shelves), whereas 'shelve' is an active verb meaning to place something onto a shelf or to postpone a business plan indefinitely. Therefore, you build a physical 'shelf', but you 'shelve' a proposal or put items away for later storage.
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