monocle vs lens system

monocle and lens system both are nouns.

Word	Noun	Adjective	Verb	Adverb
monocle	Yes	No	No	No
lens system	Yes	No	No	No

As nouns, lens system is a hypernym of monocle; that is, lens system is a word with a broader meaning than monocle:

monocle: lens for correcting defective vision in one eye; held in place by facial muscles
lens system: a transparent optical device used to converge or diverge transmitted light and to form images

Other hypernyms of monocle include lens, lense.

monocle (noun)	lens system (noun)
lens for correcting defective vision in one eye; held in place by facial muscles	a transparent optical device used to converge or diverge transmitted light and to form images