binoculars vs opera glasses

binoculars and opera glasses both are nouns.

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

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

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

Other synonyms of binoculars include field glasses.

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