know as vs dub

know as is not a noun while dub is a noun.

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

As verbs, dub is a hyponym of know as; that is, dub is a word with a more specific, narrower meaning than know as:

Other hyponyms of know as include baptise, baptize, christen, refer, style, title, nickname, rename, entitle, title, term, tag.

know as (noun)	dub (noun)
	the new sounds added by dubbing

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