jumping-off place vs point of departure

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

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

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

jumping-off place and point of departure: a place from which an enterprise or expedition is launched

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