dub vs be known as

dub is a noun but be known as is not a noun.

Word	Noun	Adjective	Verb	Adverb
dub	Yes	No	Yes	No
be known as	No	No	Yes	No

As verbs, be known as is a hypernym of dub; that is, be known as is a word with a broader meaning than dub:

Other hypernyms of dub include call, know as, name.

dub (noun)	be known as (noun)
the new sounds added by dubbing

dub (verb)	be known as (verb)
give a nickname to	look on as or consider
provide (movies) with a soundtrack of a foreign language	assign a specified (usually proper) name to
raise (someone) to knighthood