(Most of these are related to Fili and Kili...if they were to call each other names) (Mostly for fan fictions :) )
You (Plural): Menu You (singular): zu
Difficult: khelich
Dreadful: ugrudur
Fiery: ursur
Friendly: bahur
Greatest brother: undad
Greatest mother: umad
Hairy: zharmur
Heroic: nahuba
Honorable: humulKhuzd belkur: mighty dwarf
Lesser brother: indad
Lesser hair (Kili) izhuramun
Little-like: mimul
Not so good: ighlekh
Not so mighty: ibaluk
Perfect brother: sannadad
Perfect wife: sanyasith
Cold: iklal
Demon: urkhas
Perfect heir: sarayad
You pain: zu charach
Violent: narakh
Sister-like: namadul
Worm: urmu