professional life vs vocation

professional life and vocation both are nouns.

Word	Noun	Adjective	Verb	Adverb
professional life	Yes	No	No	No
vocation	Yes	No	No	No

As nouns, vocation is a hypernym of professional life; that is, vocation is a word with a broader meaning than professional life:

professional life: a career in industrial or commercial or professional activities
vocation: the particular occupation for which you are trained

Other hypernyms of professional life include calling, career.

professional life (noun)	vocation (noun)
a career in industrial or commercial or professional activities	the particular occupation for which you are trained
	a body of people doing the same kind of work