default option vs option

default option and option both are nouns.

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

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

default option: an option that is selected automatically unless an alternative is specified
option: one of a number of things from which only one can be chosen

Other hypernyms of default option include alternative, choice.

default option (noun)	option (noun)
an option that is selected automatically unless an alternative is specified	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