defenselessness vs defenseless

defenselessness is a noun but defenseless is not a noun.

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

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

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

defenselessness (adverb)	defenseless (adverb)
	without defense