fictitious name vs DBA

fictitious name and DBA both are nouns.

Word	Noun	Adjective	Verb	Adverb
fictitious name	Yes	No	No	No
DBA	Yes	No	No	No

As nouns, fictitious name and DBA are synonyms defined as:

fictitious name and DBA: (law) a name under which a corporation conducts business that is not the legal name of the corporation as shown in its articles of incorporation

Other synonyms of fictitious name include assumed name, Doing Business As.

fictitious name (noun)	DBA (noun)
(law) a name under which a corporation conducts business that is not the legal name of the corporation as shown in its articles of incorporation	(law) a name under which a corporation conducts business that is not the legal name of the corporation as shown in its articles of incorporation