call off vs schedule

call off is not a noun while schedule is a noun.

Word	Noun	Adjective	Verb	Adverb
call off	No	No	Yes	No
schedule	Yes	No	Yes	No

call off (noun)	schedule (noun)
	a temporally organized plan for matters to be attended to
	an ordered list of times at which things are planned to occur

call off (verb)	schedule (verb)
give the calls (to the dancers) for a square dance	plan for an activity or event
postpone indefinitely or annul something that was scheduled	make a schedule; plan the time and place for events