lean back vs angle

lean back is not a noun while angle is a noun.

Word	Noun	Adjective	Verb	Adverb
lean back	No	No	Yes	No
angle	Yes	No	Yes	No

As verbs, angle is a hypernym of lean back; that is, angle is a word with a broader meaning than lean back:

Other hypernyms of lean back include lean, slant, tilt, tip.

lean back (noun)	angle (noun)
	a biased way of looking at or presenting something
	the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians

lean back (verb)	angle (verb)
move the upper body backwards and down	present with a bias
	fish with a hook
	seek indirectly
	to incline or bend from a vertical position
	move or proceed at an angle