All seem to mean sharp in both a literal and abstract way
3 Answers
锋= edge ; 利= sharp; 锋利= sharp (of edge)
Example:
刀锋锋利 blade edge is sharp
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尖= pointy; 利= sharp; 尖利= pointy and sharp
Examples:
冰錐是尖利的 ice pick is pointy and sharp
尖利的工具 (pointy and sharp tool)
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锐 = piercing; 利= sharp; 锐利 = piercingly sharp(of point)
Examples:
眼光锐利 have (piercingly) sharp eyes
锐利武器 piercingly sharp weapon
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锋= edge; 锐 = piercing; 锋锐= piercingly sharp (of edge and point)
Example:
锋锐武器 piercingly sharp weapons
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尖= pointy; 锐 = piercing; 尖锐= piercingly pointy
Example:
說話尖锐 speak in a (piercingly) pointy manner
尖锐的工具 piercingly pointy tool
锋利 and 锐利 are used for describing knives and swords, e.g.: a sharp knife. 尖锐 is now used for describing topics, viewpoints, or questions, e.g.: a sharp question. 尖利 and 锋锐 are rarely used, I hardly see these words. Theoretically you may create much more new words by these near synonym.
锋利 describe a knife, something with a edge. 尖利 describe a needle, something with a point. 锋锐 is similar to 锋利, and 尖锐 is similar to 尖利. 锐利 probably would describe both, I am not sure.