I'm trying to look for motherboards without any bells and whistles (audio and video) in order to build an Audio Production workstation.
Is there any special keyword I can use in my research that would be indicative that no onboard audio or video exists on the board? "Naked board"?
Well... hopefully a keyword that conforms more to what the industry standard uses.
Discrete is the keyword you are looking for. It means "removed". When a system has discrete graphics it requires a graphics adapter to display video.
That said, it is very hard to find a modern motherboard with discrete audio. The best advice I can give is to disable anything that you don't want in the bios.
There is no such thing. I mean, there is no word for that. That "no onboard audio" will be a tough one...
You don't specify what machine architecture, so I'm going to assume IBM PC/AT compatibles.
In the world of the PC/AT compatible, the on-board audio is (nowadays) physically incorporated into the silicon chips that comprise the so-called "chipset". An Intel ICH9, for example, has an Intel HD audio device as PCI device #27, function #0. It's not physically possible to have an ICH9 without on-board audio. The most that a motherboard manufacturer might do is not wire the signal pins from the chip to I/O codec circuitry. Similarly, "disabling" the device in the firmware setup utility means very little in most situations, as modern protected mode operating systems directly enumerate the PCI bus, will find the audio device, and will attempt to drive it.
On-board video is a different matter. Such functionality is not universally integrated onto motherboards, and is rather the function of a display adapter device, usually an expansion card that is plugged into an expansion slot on the motherboard. So there's nothing to ask here in terms of the motherboard itself. Simply buy a motherboard without buying a display adapter expansion card to go with it. ☺
I don't think there is a term for it as such. The actual non-integrated cards are reffered to by the term "discrete" but having a discrete card doesn't mean you don't also have an integrated soloution. Normally you can disable it in the BIOS (contrary to what JdeBP says I've found disabling stuff in the BIOS does generally stop the OS seeing it).
I haven't seen a Desktop motherboard without sound in many years. The costs of integrating it are very low (partly because a large part of the functionality is included in the chipset) and most buyers want it. People who care enough about audio to want a higher-quality dedicated card are a small niche and not worth making a special product for. Some server boards seem to lack it but they may have other characteristics that are inappropriate.
Regarding integrated graphics it generally depends on the chipset. If the chipset supports integrated graphics than the motherboard vendor will nearly always connect it up, but there are some chipsets that don't support graphics. For example X48, X58, P55, P67, X79 and X99.
