outward-bound vs departing

outward-bound and departing both are adjectives.

Word	Noun	Adjective	Verb	Adverb
outward-bound	No	Yes	No	No
departing	No	Yes	No	No

As adjectives, outward-bound and departing are synonyms defined as:

Other synonyms of outward-bound include outbound, outward.

outward-bound (adjective)	departing (adjective)
that is going out or leaving	that is going out or leaving