On 10/21/2020 11:24 AM, Will Martin wrote:

I’m making no claims about lip movement similarities between the English meaning and {pIrmuS} and {bIS'ub}. I’m saying the lip movements of the two Klingon words are similar to each other, while the sound is remarkably different. Same vowels in the same position in each of two syllables, {p} and {b} are visually indistinguishable and the other differences are not visually obvious.

Two words with tightly related meaning that have very similar lip movements, but very different sounds.

The lip-movements of pIr and bIS are similar, but the movements of muS and 'ub are very different.