decision vs appointment

decision and appointment both are nouns.

Word	Noun	Adjective	Verb	Adverb
decision	Yes	No	No	No
appointment	Yes	No	No	No

As nouns, appointment is a hyponym of decision; that is, appointment is a word with a more specific, narrower meaning than decision:

Other hyponyms of decision include assignment, designation, naming, call, move, casting lots, drawing lots, sortition, resolution.

decision (noun)	appointment (noun)
the act of making up your mind about something	the act of putting a person into a non-elective position
the trait of resoluteness as evidenced by firmness of character or purpose	the job to which you are (or hope to be) appointed
a position or opinion or judgment reached after consideration	(law) the act of disposing of property by virtue of the power of appointment
the outcome of a game or contest	(usually in the plural) furnishings and equipment (especially for a ship or hotel)
(boxing) a victory won on points when no knockout has occurred	a meeting arranged in advance
	a person who is appointed to a job or position