toll vs knell

toll and knell both are nouns.

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

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

toll: the sound of a bell being struck
knell: the sound of a bell rung slowly to announce a death or a funeral or the end of something

Other hyponyms of toll include angelus, angelus bell.

As verbs, knell is a hypernym of toll; that is, knell is a word with a broader meaning than toll:

Other hypernyms of toll include ring.

toll (noun)	knell (noun)
value measured by what must be given or done or undergone to obtain something	the sound of a bell rung slowly to announce a death or a funeral or the end of something
the sound of a bell being struck
a fee levied for the use of roads or bridges

toll (verb)	knell (verb)
ring slowly	ring as in announcing death
charge a fee for using	make (bells) ring, often for the purposes of musical edification