Invocation, evocation, and provocation share the suffix voke, which means "to call."
Evoke - to call out, call forth, elicit, awaken, call forth, excite, bring to conscious mind, bring into being, brainstorm, bring about, generate, give rise to, originate, sow the seeds, dream up, make, produce
Provoke - stir up, arouse, incite, cause, make waves, stimulate, start, fire up, enthuse, lead to, motivate, instigate, pique, thrill, promote, challenge, kindle, electrify, bring on, induce, inspire
Invoke - to call upon, appeal to, conjure, call from within, call on inspiration/something larger, entreat, implore, summon, pray, solicit, urge, implement, bring forward, appeal to, quest for.
(Definitions are compiled from several online dictionaries and thesaurus's)
While the distinctions are subtle and not clear cut, I see each as an essential part of cultivating your unique calling - the place where your creativity and aliveness meet the needs of the world: