1. The god of the sea; a large planet beyond Uranus.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• nepturn,
• neptun,
• nepton,
• beptune,
• meptune,
• jeptune,
• heptune,
• nwptune,
• nsptune,
• ndptune,
• nrptune,
• n4ptune,
• n3ptune,
• neotune,
• neltune,
• ne-tune,
• ne0tune,
• neprune,
• nepfune,
• nepgune

• neptunium.

The adjective form of the word "Neptune" is "Neptunian".

The plural form of the word "Neptune" is "Neptunes"

The singular form of the word "neptune" is still "Neptune".