compound lens vs lens system

compound lens and lens system both are nouns.

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

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

compound lens: a lens system consisting of two or more lenses on the same axis
lens system: a transparent optical device used to converge or diverge transmitted light and to form images

Other hypernyms of compound lens include lens, lense.

compound lens (noun)	lens system (noun)
a lens system consisting of two or more lenses on the same axis	a transparent optical device used to converge or diverge transmitted light and to form images