electric eye vs sensor

electric eye and sensor both are nouns.

Word	Noun	Adjective	Verb	Adverb
electric eye	Yes	No	No	No
sensor	Yes	No	No	No

As nouns, sensor is a hypernym of electric eye; that is, sensor is a word with a broader meaning than electric eye:

electric eye: a transducer used to detect and measure light and other radiations
sensor: any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner

Other hypernyms of electric eye include detector, sensing element, transducer.

electric eye (noun)	sensor (noun)
a transducer used to detect and measure light and other radiations	any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner