schedule vs call off

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

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

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

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