The incorrectly spelled word is Robbust. The correct spelling is Robust.
- Xylophone is spelled correctly. It is a musical instrument consisting of a series of wooden bars graduated in length to produce the musical scale, supported on belts of straw or felt, and sounded by striking with two small wooden hammers.
- Oligopoly is spelled correctly. It is a market structure in which a small number of sellers control a large share of the market.
- Robust is spelled correctly. It means strong and healthy.
- Zenith is spelled correctly. It means the highest point or point of greatest success.
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