I’ve never even considered that it could be understood like that, heh. It’s always been intended as “a recording of a few minutes off the entire work”, or stuff like that.
For music only, we have “instrumental” when it fits (but karaoke people said not to use it when it’s karaoke because the lyricist is still relevant to karaoke recordings).
For vocals only we don’t currently have anything, but unless you’re just reciting the lyrics without singing them, the melody is still there anyway, so I suspect it’s only relevant for things like hip hop.