• ipal glass,
• kpal glass,
• lpal glass,
• ppal glass,
• 0pal glass,
• 9pal glass,
• ooal glass,
• olal glass,
• o-al glass,
• o0al glass,
• opzl glass,
• opsl glass,
• opwl glass,
• opql glass,
• opak glass,
• opap glass,
• opao glass,
• opal flass,
• opal vlass,
• opal blass

The adjective form of the word "opal glass" is "opaline".

The plural form of the word "opal glass" is "opal glasses".

The singular form of the word "opal glass" is "opal glass". The term "opal glass" does not change between singular and plural forms.