strikeout vs strike out

strikeout is a noun but strike out is not a noun.

Word	Noun	Adjective	Verb	Adverb
strikeout	Yes	No	No	No
strike out	No	No	Yes	No

strikeout (noun)	strike out (noun)
an out resulting from the batter getting three strikes

strikeout (verb)	strike out (verb)
	set out on a course of action
	remove from a list
	cause to get out
	put out or be put out by a strikeout
	make a motion as with one's fist or foot towards an object or away from one's body
	be unsuccessful in an endeavor