double date vs appointment

double date and appointment both are nouns.

Word	Noun	Adjective	Verb	Adverb
double date	Yes	No	No	No
appointment	Yes	No	No	No

As nouns, appointment is a hypernym of double date; that is, appointment is a word with a broader meaning than double date:

Other hypernyms of double date include date, engagement.

double date (noun)	appointment (noun)
a date in which two couples participate	the act of putting a person into a non-elective position
	the job to which you are (or hope to be) appointed
	(law) the act of disposing of property by virtue of the power of appointment
	(usually in the plural) furnishings and equipment (especially for a ship or hotel)
	a meeting arranged in advance
	a person who is appointed to a job or position