fixed vs fixedness

fixed is not a noun while fixedness is a noun.

Word	Noun	Adjective	Verb	Adverb
fixed	No	Yes	No	No
fixedness	Yes	No	No	No

fixed (noun)	fixedness (noun)
	the quality of being fixed in place as by some firm attachment
	the quality of being fixed and unchangeable
	remaining in place

fixed (adjective)	fixedness (adjective)
securely placed or fastened or set
(of a number) having a fixed and unchanging value
fixed and unmoving
incapable of being changed or moved or undone; e.g. "frozen prices"