Name: The vibraphone (wikipedia) already exists in the instrument list.
Also Known As: vibes, as noted in the infobox on the Wikipedia page

Reason for request: Many jazz recordings will say that an artist is playing the "vibes" rather than the vibraphone, and this terminology is used on liner notes.  When adding relationships, I searched on "vibes" since it was used on three CDs I was entering; however, there was no guidance as to what the full name of the instrument is.