refer vs invoke

refer and invoke both are verbs.

Word	Noun	Adjective	Verb	Adverb
refer	No	No	Yes	No
invoke	No	No	Yes	No

As verbs, invoke is a hyponym of refer; that is, invoke is a word with a more specific, narrower meaning than refer:

refer (verb)	invoke (verb)
think of, regard, or classify under a subsuming principle or with a general group or in relation to another	cite as an authority; resort to
have as a meaning	request earnestly (something from somebody); ask for aid or protection
make reference to	summon into action or bring into existence, often as if by magic
use a name to designate
seek information from
send or direct for treatment, information, or a decision
be relevant to