• operaglass,
• ipera glass,
• kpera glass,
• lpera glass,
• ppera glass,
• 0pera glass,
• 9pera glass,
• ooera glass,
• olera glass,
• o-era glass,
• o0era glass,
• opwra glass,
• opsra glass,
• opdra glass,
• oprra glass,
• op4ra glass,
• op3ra glass,
• opeea glass,
• opeda glass,
• opefa glass

The adjective form of the term "opera glass" is "operatic".

The plural form of the word "opera glass" is "opera glasses"

The singular form of the word "opera glass" is "opera glass". The term "opera glass" is already singular and refers to a small binocular typically used for viewing performances in an opera or theater.