defencelessness vs defenceless

defencelessness is a noun but defenceless is not a noun.

Word	Noun	Adjective	Verb	Adverb
defencelessness	Yes	No	No	No
defenceless	No	Yes	No	Yes

defencelessness (noun)	defenceless (noun)
the property of being helpless in the face of attack

defencelessness (adjective)	defenceless (adjective)
	lacking weapons for self-defense
	lacking protection or support

defencelessness (adverb)	defenceless (adverb)
	without defense