inertial navigation system vs automatic pilot

inertial navigation system and automatic pilot both are nouns.

Word	Noun	Adjective	Verb	Adverb
inertial navigation system	Yes	No	No	No
automatic pilot	Yes	No	No	No

inertial navigation system (noun)	automatic pilot (noun)
a system to control a plane or spacecraft; uses inertial forces	a navigational device that automatically keeps ships or planes or spacecraft on a steady course
	a cognitive state in which you act without self-awareness