opera glasses vs binoculars

opera glasses and binoculars both are nouns.

Word	Noun	Adjective	Verb	Adverb
opera glasses	Yes	No	No	No
binoculars	Yes	No	No	No

As nouns, opera glasses and binoculars are synonyms defined as:

opera glasses and binoculars: (plural) an optical instrument designed for simultaneous use by both eyes

Other synonyms of opera glasses include field glasses.

opera glasses (noun)	binoculars (noun)
(plural) an optical instrument designed for simultaneous use by both eyes	(plural) an optical instrument designed for simultaneous use by both eyes