Synonyms of 'beside'
usage note:People occasionally confuse beside and besides. Besides is used for mentioning something that adds to what you have already said, for example: I didn't feel like going and besides, I had nothing to wear. Beside usually means next to or at the side of something or someone, for example: he was standing beside me (not besides me).
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Thesaurus for beside from the Collins English Thesaurus
Something that is beside something else is at the side of it or next to it.