隣・横

About

Both 隣となり and 横よこ mean "beside", but differ subtly in usage and meaning.

隣となり refers to the closest thing in a row of the same category.

横よこ refers to anything that exists in a direct line to the left or right of a given thing.

Neither 隣となり nor 横よこ can be used for things that are above or below something else.

Summary

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  Both 隣となり and 横よこ mean "beside"

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  隣となり refers to the closest thing in a row of the same category

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  横よこ refers to anything that exists in a direct line to the left or right of a given thing