MOO stands for "MUD Object Oriented" and, like MUSH, is a descendant of TinyMUD. A MUSH is therefore different from a MUD in the same way as a Diku or LP - it's a descendant, but still a type of MUD.
Graphical MUDs have a better claim of being separate (as do other scratch-written codebases), but they're still part of the same genre as MUDs.
The categorisations tend to be introduced more as an attempt to stand out from the competition rather than to serve any real useful purpose - even today you'll occasionally see people claiming things like "our MUD is so advanced that it's no longer even a MUD!"
Personally I see no value in the propagation of such classifications, except perhaps from a marketting perspective (if you don't have the features to stand out, slap a fancy name on the product and pretend it's something else).
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