want vs lack

want and lack both are nouns.

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

As nouns, want and lack are synonyms defined as:

want and lack: the state of needing something that is absent or unavailable

Other synonyms of want include deficiency.

As verbs, lack is a hypernym of want; that is, lack is a word with a broader meaning than want:

Other hypernyms of want include miss.

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

want (verb)	lack (verb)
wish or demand the presence of	be without
have need of	To be insufficiently prepared
hunt or look for; want for a particular reason
feel or have a desire for; want strongly
be without, lack; be deficient in