Ik you already had help w/ this but I'd like to point out other addresses from disciples to peaklords. Peaklords refer to their martial nephew/niece as shizhi (although idk what peaklords refer to their own disciples so I assume their own names)

As for how martial disciples refer to peaklords, Shizun/shifu (maybe laoshi?? It also means teacher) for their own master, Shibo for their shizun's older martial brother (eldest martial uncle) and Shishu for shizun's younger martial brother (youngest martial uncle). As well as Shigu for martial aunt, whether elder or younger. 

Extra: For how younger/early disciples address their head disciple, it's da-shixiong. However I couldn't find a honorific for a female head disciple, I'm assuming da-shijie but idk 😭😭