Opperment
orpiment
Opponent
adversary
Perzent
percent
Experiment
experiment
Ferment
enzyme
Doppelagent
double agent
Doppeldenk
doublethink
Oppeln
Opole
Doppelbett
double bed
full-size bed
king-size bed
opportun
opportune
suitable
Kippelement
tipping element
Uppercut
uppercut
Pergement
vellum
Superman
Superman
Supermann
superman
Supermond
supermoon
perlend
fizzy
Hypertext
hypertext
Imperfekt
imperfect
preterimperfect
Operette
operetta