• etherne,
• wthrane,
• sthrane,
• dthrane,
• rthrane,
• 4thrane,
• 3thrane,
• erhrane,
• efhrane,
• eghrane,
• eyhrane,
• e6hrane,
• e5hrane,
• etgrane,
• etbrane,
• etnrane,
• etjrane,
• eturane,
• ethrans,
• etharne

• eternise,
• eternize,
• eternally,
• eternalise,
• eternity,
• eternalize,
• ethernet,
• eternal.

The plural form of the word "ethrane" is "ethranes".

The singular form of the word "ethrane" is "ethrane". "Ethrane" is already a singular noun and there is no need to change its form.