jumping-off point vs point of departure

jumping-off point and point of departure both are nouns.

Word	Noun	Adjective	Verb	Adverb
jumping-off point	Yes	No	No	No
point of departure	Yes	No	No	No

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

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

Other synonyms of jumping-off point include springboard.

jumping-off point (noun)	point of departure (noun)
a beginning from which an enterprise is launched	a beginning from which an enterprise is launched
	a place from which an enterprise or expedition is launched