• compuer,
• coppier,
• couwer,
• colpor,
• cyper,
• compaer,
• coper,
• couier,
• coupel,
• scouper,
• compe,
• ceaper,
• copyer,
• cother,
• couer,
• copey,
• coquer,
• corpet,
• corpert,
• cowar

• cowberry,
• copher,
• cobra,
• copra,
• coppery,
• cooper,
• coffer,
• coover,
• copper,
• copier,
• cover,
• cofer,
• cobber.

The adjective form of the word "Cowper" would be "Cowperian".

The plural form of the word "cowper" is "cowpers".

The singular form of the word "cowper" is "cowper". The word does not have a distinct singular form; it remains the same in both singular and plural forms.