sideboard vs. credenza

a piece of furniture, as in a dining room, often with shelves, drawers, etc., for holding articles of table service.

a board forming a side or a part of a side; sidepiece.

sideboards, Slang. side whiskers.

Also a sideboard or buffet, especially one without legs.

a closed cabinet for papers, office supplies, etc., often of desk height and matching the other furniture in an executive's office.

Ecclesiastical. credence ( def 3 ).