eyeglass vs monocle

eyeglass and monocle both are nouns.

Word	Noun	Adjective	Verb	Adverb
eyeglass	Yes	No	No	No
monocle	Yes	No	No	No

As nouns, eyeglass and monocle are synonyms defined as:

eyeglass and monocle: lens for correcting defective vision in one eye; held in place by facial muscles

eyeglass (noun)	monocle (noun)
lens for correcting defective vision in one eye; held in place by facial muscles	lens for correcting defective vision in one eye; held in place by facial muscles