“Substitute a short synonym” is really, really not what tabooing a word is:
When you find yourself in philosophical difficulties, the first line of defense is not to define your problematic terms, but to see whether you can think without using those terms at all. Or any of their short synonyms. And be careful not to let yourself invent a new word to use instead. Describe outward observables and interior mechanisms; don’t use a single handle, whatever that handle may be.
“Substitute a short synonym” is really, really not what tabooing a word is:
You basically asked me to define “good” while tabooing morality.
That’s basically the sort of thing the concept of tabooing was invented for, though.
To prove when two words are closely connected enough that it’s impossible to define one without the other? I don’t agree.
The point is to stop talking about words, and start talking about reality.