• coppier,
• cahpter,
• contuer,
• chpter,
• conter,
• comptur,
• jupter,
• coptor,
• coputers,
• coutor,
• coposer,
• coper,
• coutier,
• copyed,
• conuter,
• chpater,
• copmuter,
• coster,
• compteur,
• moptor

• caper,
• cater,
• copied,
• Coped,
• computer,
• Cooped,
• copper,
• cope,
• cuter.

The adjective form of "copter" is "copteric". However, it is not a commonly used term. In most cases, the word "copter" is used as a noun to refer to a helicopter.

The plural of the "copter" can be the "copters".

The singular of the "copter" can be the "copter".