refer vs know as

refer and know as both are verbs.

Word	Noun	Adjective	Verb	Adverb
refer	No	No	Yes	No
know as	No	No	Yes	No

As verbs, know as is a hypernym of refer; that is, know as is a word with a broader meaning than refer:

Other hypernyms of refer include be known as, call, name.

refer (verb)	know as (verb)
think of, regard, or classify under a subsuming principle or with a general group or in relation to another	look on as or consider
have as a meaning	assign a specified (usually proper) name to
make reference to
use a name to designate
seek information from
send or direct for treatment, information, or a decision
be relevant to