jumpstart vs jump-start

jumpstart and jump-start both are nouns.

Word	Noun	Adjective	Verb	Adverb
jumpstart	Yes	No	Yes	No
jump-start	Yes	No	Yes	No

As nouns, jumpstart and jump-start are synonyms defined as:

jumpstart and jump-start: starting an automobile engine that has a weak battery by means of jumper cables to another car

As verbs, jumpstart and jump-start are synonyms defined as:

As verbs, jumpstart and jump-start are synonyms defined as:

jumpstart and jump-start: start (a car engine whose battery is dead) by connecting it to another car's battery

Other synonyms of jumpstart include jump.

jumpstart (noun)	jump-start (noun)
starting an automobile engine that has a weak battery by means of jumper cables to another car	starting an automobile engine that has a weak battery by means of jumper cables to another car

jumpstart (verb)	jump-start (verb)
start or re-start vigorously	start or re-start vigorously
start (a car engine whose battery is dead) by connecting it to another car's battery	start (a car engine whose battery is dead) by connecting it to another car's battery