replace vs replacement

replace is not a noun while replacement is a noun.

Word	Noun	Adjective	Verb	Adverb
replace	No	No	Yes	No
replacement	Yes	No	No	No

replace (noun)	replacement (noun)
	the act of furnishing an equivalent person or thing in the place of another
	a person or thing that takes or can take the place of another
	an event in which one thing is substituted for another
	a person who follows next in order
	someone who takes the place of another person
	filling again by supplying what has been used up

replace (verb)	replacement (verb)
substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected)
put something back where it belongs
put in the place of another; switch seemingly equivalent items
take the place or move into the position of