impossible action vs option

impossible action and option both are nouns.

Word	Noun	Adjective	Verb	Adverb
impossible action	Yes	No	No	No
option	Yes	No	No	No

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

Other hypernyms of impossible action include alternative, choice.

impossible action (noun)	option (noun)
an alternative that is not available	the act of choosing or selecting
	one of a number of things from which only one can be chosen
	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