My take but trying to sound fancy and unique and unconventional while making somewhat sense
Mage → Pishogue (bro you use chaos energy)
Conjurer → Munizard (wordplay on munitions and wizard)
Warlock → Gish (I was bored)
Knight → Paladin (I mean it’s cliche)/Sprite
Paladin → Theurgist (cause spells and divine stuff, sounds fancy)
Juggernaut → Cenobite (probably some random stuff)
Warrior → Swungaff (sword/gun/staff)
Warlord → Panart ( panoply/stalwart)
Oracle → Deiform (haha synonyms go brrrrr)
Savant → Protean
Beserker → Vandal