DBA vs fictitious name

DBA and fictitious name both are nouns.

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

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

DBA and fictitious name: (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 DBA include assumed name, Doing Business As.

DBA (noun)	fictitious name (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