decision vs option

decision and option both are nouns.

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

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

Other hypernyms of decision include choice, pick, selection.

decision (noun)	option (noun)
the act of making up your mind about something	the act of choosing or selecting
the trait of resoluteness as evidenced by firmness of character or purpose	one of a number of things from which only one can be chosen
a position or opinion or judgment reached after consideration	the right to buy or sell property at an agreed price; the right is purchased and if it is not exercised by a stated date the money is forfeited
the outcome of a game or contest
(boxing) a victory won on points when no knockout has occurred