sicken vs wan

sicken is not an adjective while wan is an adjective.

Word	Noun	Adjective	Verb	Adverb
sicken	No	No	Yes	No
wan	No	Yes	Yes	No

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

Other hyponyms of sicken include contract, get, take, canker.

sicken (adjective)	wan (adjective)
	abnormally deficient in color as suggesting physical or emotional distress
	(of light) lacking in intensity or brightness; dim or feeble
	lacking vitality as from weariness or illness or unhappiness

sicken (verb)	wan (verb)
get sick	become pale and sickly
make sick or ill
cause aversion in; offend the moral sense of
upset and make nauseated