field lens vs lense

field lens and lense both are nouns.

Word	Noun	Adjective	Verb	Adverb
field lens	Yes	No	No	No
lense	Yes	No	No	No

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

field lens: the lens that is farthest from the eye in an optical device with more than one lens
lense: a transparent optical device used to converge or diverge transmitted light and to form images

Other hypernyms of field lens include lens, lens system.

field lens (noun)	lense (noun)
the lens that is farthest from the eye in an optical device with more than one lens	a transparent optical device used to converge or diverge transmitted light and to form images