decision vs resolution

decision and resolution both are nouns.

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

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

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

As nouns, resolution is a hypernym of decision; that is, resolution is a word with a broader meaning than decision:

decision: the trait of resoluteness as evidenced by firmness of character or purpose
resolution: the trait of being resolute

Other hypernyms of decision include firmness, firmness of purpose, resoluteness, resolve.

decision (noun)	resolution (noun)
the act of making up your mind about something	a decision to do something or to behave in a certain manner
the trait of resoluteness as evidenced by firmness of character or purpose	finding a solution to a problem
a position or opinion or judgment reached after consideration	the trait of being resolute
the outcome of a game or contest	analysis into clear-cut components
(boxing) a victory won on points when no knockout has occurred	something settled or resolved; the outcome of decision making
	a statement that solves a problem or explains how to solve the problem
	a formal expression by a meeting; agreed to by a vote
	(music) a dissonant chord is followed by a consonant chord
	the subsidence of swelling or other signs of inflammation (especially in a lung)
	the ability of a microscope or telescope to measure the angular separation of images that are close together
	(computer science) the number of pixels per square inch on a computer-generated display; the greater the resolution, the better the picture