inertial guidance system vs autopilot

inertial guidance system and autopilot both are nouns.

Word	Noun	Adjective	Verb	Adverb
inertial guidance system	Yes	No	No	No
autopilot	Yes	No	No	No

inertial guidance system (noun)	autopilot (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