profession vs vocation

profession and vocation both are nouns.

Word	Noun	Adjective	Verb	Adverb
profession	Yes	No	No	No
vocation	Yes	No	No	No

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

Other hypernyms of profession include occupational group.

profession (noun)	vocation (noun)
an occupation requiring special education (especially in the liberal arts or sciences)	the particular occupation for which you are trained
an open avowal (true or false) of some belief or opinion	a body of people doing the same kind of work
affirmation of acceptance of some religion or faith
the body of people in a learned occupation