defenseless vs defenselessness

defenseless is not a noun while defenselessness is a noun.

Word	Noun	Adjective	Verb	Adverb
defenseless	No	Yes	No	Yes
defenselessness	Yes	No	No	No

defenseless (noun)	defenselessness (noun)
	the property of being helpless in the face of attack

defenseless (adjective)	defenselessness (adjective)
lacking weapons for self-defense
having no protecting or concealing cover
lacking protection or support

defenseless (adverb)	defenselessness (adverb)
without defense