• cononseed,
• cottenseed,
• cottnseed,
• xottonseed,
• vottonseed,
• fottonseed,
• dottonseed,
• cittonseed,
• ckttonseed,
• clttonseed,
• cpttonseed,
• cottonseeds,
• cottinweed,
• bottonweed,
• coton seed,
• Cotton sead,
• cotonseeds,
• cottonoide,
• gottonfeet,
• Bottonwede

• cotton cake,
• cotton grass,
• cottonwick,
• cotangent,
• cotton gin,
• cotinus,
• cotton mouse,
• coetaneous,
• cotton candy.

The adjective form of "cottonseed" is "cottonseed". Adjectives do not typically change their form from the noun they describe.