want vs yearn

want is a noun but yearn is not a noun.

Word	Noun	Adjective	Verb	Adverb
want	Yes	No	Yes	No
yearn	No	No	Yes	No

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

want (noun)	yearn (noun)
a specific feeling of desire
anything that is necessary but lacking
a state of extreme poverty
the state of needing something that is absent or unavailable

want (verb)	yearn (verb)
wish or demand the presence of	desire strongly or persistently
have need of	have a desire for something or someone who is not present
hunt or look for; want for a particular reason	have affection for; feel tenderness for
feel or have a desire for; want strongly
be without, lack; be deficient in