hang on vs ring

hang on is not a noun while ring is a noun.

Word	Noun	Adjective	Verb	Adverb
hang on	No	No	Yes	No
ring	Yes	No	Yes	No

hang on (noun)	ring (noun)
	jewelry consisting of a circlet of precious metal (often set with jewels) worn on the finger
	a strip of material attached to the leg of a bird to identify it (as in studies of bird migration)
	a rigid circular band of metal or wood or other material used for holding or fastening or hanging or pulling
	a platform usually marked off by ropes in which contestants box or wrestle
	a characteristic sound
	the sound of a bell ringing
	an association of criminals
	(chemistry) a chain of atoms in a molecule that forms a closed loop
	a toroidal shape

hang on (verb)	ring (verb)
be persistent, refuse to stop	get or try to get into communication (with someone) by telephone
hold the phone line open	attach a ring to the foot of, in order to identify
fix to; attach	extend on all sides of simultaneously; encircle
	sound loudly and sonorously
	make (bells) ring, often for the purposes of musical edification
	ring or echo with sound