background vs backgrounder

background and backgrounder both are nouns.

Word	Noun	Adjective	Verb	Adverb
background	Yes	No	Yes	No
backgrounder	Yes	No	No	No

background (noun)	backgrounder (noun)
scenery hung at back of stage	a press conference or interview in which a government official explains to reporters the background of an action or policy
(computer science) the area of the screen in graphical user interfaces against which icons and windows appear
a person's social heritage: previous experience or training
the part of a scene (or picture) that lies behind objects in the foreground
information that is essential to understanding a situation or problem
extraneous signals that can be confused with the phenomenon to be observed or measured
relatively unimportant or inconspicuous accompanying situation
the state of the environment in which a situation exists

background (verb)	backgrounder (verb)
understate the importance or quality of