inertial navigation vs guidance

inertial navigation and guidance both are nouns.

Word	Noun	Adjective	Verb	Adverb
inertial navigation	Yes	No	No	No
guidance	Yes	No	No	No

As nouns, guidance is a hypernym of inertial navigation; that is, guidance is a word with a broader meaning than inertial navigation:

inertial navigation: a method of controlling the flight of a missile by devices that respond to inertial forces
guidance: the act of setting and holding a course

Other hypernyms of inertial navigation include direction, steering.

inertial navigation (noun)	guidance (noun)
a method of controlling the flight of a missile by devices that respond to inertial forces	the act of setting and holding a course
	the act of guiding or showing the way
	something that provides direction or advice as to a decision or course of action