ring vs knell

ring and knell both are nouns.

Word	Noun	Adjective	Verb	Adverb
ring	Yes	No	Yes	No
knell	Yes	No	Yes	No

As verbs, knell is a hyponym of ring; that is, knell is a word with a more specific, narrower meaning than ring:

Other hyponyms of ring include ding, dingdong, dong, tintinnabulate, peal.

As verbs, ring and knell are synonyms defined as:

ring and knell: make (bells) ring, often for the purposes of musical edification

ring (noun)	knell (noun)
jewelry consisting of a circlet of precious metal (often set with jewels) worn on the finger	the sound of a bell rung slowly to announce a death or a funeral or the end of something
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)	knell (verb)
get or try to get into communication (with someone) by telephone	ring as in announcing death
attach a ring to the foot of, in order to identify	make (bells) ring, often for the purposes of musical edification
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