hold on vs ring

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

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

hold 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

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