springboard vs jumping-off point

springboard and jumping-off point both are nouns.

Word	Noun	Adjective	Verb	Adverb
springboard	Yes	No	No	No
jumping-off point	Yes	No	No	No

As nouns, springboard and jumping-off point are synonyms defined as:

springboard and jumping-off point: a beginning from which an enterprise is launched

Other synonyms of springboard include point of departure.

springboard (noun)	jumping-off point (noun)
a beginning from which an enterprise is launched	a beginning from which an enterprise is launched
a flexible board for jumping upward