ring vs hold on

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

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

ring (noun)	hold on (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

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