/rgh/ isn’t the only consonant cluster “allowed”. /w'/ and /y'/ occur as well. Remember the /’/ qaghwI’ (a.k.a. aleph or the glottal stop) is also a consonant in Klingon – as it is in Arabic for example -- and should be properly enunciated. The following pairs of words sound different to Klingons: maw offend maw' be crazy paw arrive paw' collide bey howl, yell bey' ceremonial display Duy agent Duy' defect As for why these clusters and not others, well that’s one of those “just because” rules we have to accept. -- Voragh From: mayqel qunenoS Is it known, why the {rgh} is the only consonant cluster which is allowed at the end of a word ? What makes it so special with regards to any other consonant clusters ? ~ nIghma' On Oct 31, 2017 16:34, "SuStel" <sustel@trimboli.name<mailto:sustel@trimboli.name>> wrote: On 10/31/2017 4:16 AM, mayqel qunenoS wrote: Neither does the SIla'. ~ nIghma' On Oct 31, 2017 10:09 AM, "mayqel qunenoS" <mihkoun@gmail.com<mailto:mihkoun@gmail.com>> wrote: Neither 'uSu' nor ghevI' follow the cvc klingon phonology. ~ nIghma' The complete Klingon phonology (C = consonant; V = vowel): CV CVC CVw' CVy' CVrgh excluding: Cow Cow' Cuw Cuw' ----- 'uSu' = 'u + Su' = CV + CVC ghevI' = ghe + vI' = CV + CVC SIla' = SI + la' = CV + CVC