know as vs look upon

know as and look upon both are verbs.

Word	Noun	Adjective	Verb	Adverb
know as	No	No	Yes	No
look upon	No	No	Yes	No

As verbs, know as and look upon are synonyms defined as:

Other synonyms of know as include be known as, esteem, look on, regard as, repute, take to be, think of.

know as (verb)	look upon (verb)
look on as or consider	look on as or consider
assign a specified (usually proper) name to