willing vs intention

willing and intention both are nouns.

Word	Noun	Adjective	Verb	Adverb
willing	Yes	Yes	No	No
intention	Yes	No	No	No

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

willing (noun)	intention (noun)
the act of making a choice	an act of intending; a volition that you intend to carry out
	an anticipated outcome that is intended or that guides your planned actions
	(usually plural) the goal with respect to a marriage proposal

willing (adjective)	intention (adjective)
disposed or inclined toward
not brought about by coercion or force