double-park vs park

double-park is not a noun while park is a noun.

Word	Noun	Adjective	Verb	Adverb
double-park	No	No	Yes	No
park	Yes	No	Yes	No

As verbs, park is a hypernym of double-park; that is, park is a word with a broader meaning than double-park:

double-park (noun)	park (noun)
	a facility in which ball games are played (especially baseball games)
	a gear position that acts as a parking brake
	a large area of land preserved in its natural state as public property
	a piece of open land for recreational use in an urban area
	a lot where cars are parked

double-park (verb)	park (verb)
park a vehicle alongside another	place temporarily
	maneuver a vehicle into a parking space