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Different evolutionary paths create different words for objects that appear to have a similar function. And so, don't you think it is more valuable to follow the pathway of the arisal of a word to its source than to twist all the meanings and parimutations into a cable to pass through to one definitive meaning?
Stool could very well have evolved from a three legged milking chair that was different from a higher kitchen chair and so was given another name to prevent confusion. When stool became taller or wider or was given a back it did not change but evolved from a root meaning attacted to an original object description.
And so a stool is not a chair and a sofa is not a chair in its evolutionary or its root meaning and those knowledgeable in furniture are not confused.
The confusion arises when you want to extract deep understanding of the nature of meaning and words based upon a tempest in a teapot riddle that can be contadicted at every turn.
Understanding meaning comes from the application of valid pricipals that are tested and applied. Such as root meanings of important word choices so that the desired object can be understood.
That is how we do it in Buddhism.