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A request which would only waste Steven's time. You already know there's a check box for 'no lylrics' so I suggest using it. In another thread it's already been explained to you how to create a highlight rule to display tracks with no lyrics.
You can create a custom tag for 'instrumental' and search using that. Then when you have all the instrumentals displayed, mark them all with 'no lyrics.'
The tools already exist to do this.
In addition, you can add
<LYP_NoLyricsText>Spoken Word, Instrumental, or No Lyrics</LYP_NoLyricsText>
to MusicBee3Settings.ini (found in the AppData directory where MB is installed)
which will display this in the lyrics panel:

1. I address issues I'm having, and also put it open for discussion so a solution can actually be found and had in which can work with MusicBee.
You can call that "wasting someone's time" if you want, I call it addressing an issue I have found with dealing with my music files and in relation to lyrics and this program.
2. And I responded to you in that other thread that your solution doesn't actually address the issue I was talking about. It's a nice new way of "seeing" what files might not have lyrics, but doesn't at all address what I was requesting and had a problem with.
3. Okay, now we are getting into something productive to the thread...
So, are you saying I can add my OWN custom Tag to all my Instrumental music files, and then of course I can highlight them all and of course it the "No Lyrics" choice?
Great... This sounds like a reasonable manual solution... as a workaround.
Someone else mentioned "Genres"... Would this actually be the ideal solution? I just add the term there? It's a good idea...
Ultimately, eventually like we have for other things, it would be good for there to be a function in place per my OP.
For the program to automatically ignore files that have the words "instrumental" in them when doing a Lyrics Search. Or if there's another way.
But, thank you for providing a solution... I just have to make sure I've got those words in all my files.