defenceless vs defencelessness

defenceless is not a noun while defencelessness is a noun.

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

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

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

defenceless (adverb)	defencelessness (adverb)
without defense