operator vs engineer

operator and engineer both are nouns.

Word	Noun	Adjective	Verb	Adverb
operator	Yes	No	No	No
engineer	Yes	No	Yes	No

As nouns, engineer is a hyponym of operator; that is, engineer is a word with a more specific, narrower meaning than operator:

operator (noun)	engineer (noun)
an agent that operates some apparatus or machine	a person who uses scientific knowledge to solve practical problems
someone who owns or operates a business	the operator of a railway locomotive
a shrewd or unscrupulous person who knows how to circumvent difficulties
a speculator who trades aggressively on stock or commodity markets
(mathematics) a symbol or function representing a mathematical operation

operator (verb)	engineer (verb)
	plan and direct (a complex undertaking)
	design as an engineer