NOTE: Because there are so many feminine -in nouns, only exceptions are listed here.
s Aspirin aspirin
r Harlekin clown
s Benzin gasoline, petrol
r Urin urine
Nouns Ending in -o - Usually neuter
NOTE: Gender exceptions are marked *
s Abo subscription (short for s Abonnement)
s Auto auto, car
e Avocado* avocado
e Demo* (street) demo (short for e Demonstration)
e Disco/Disko* disco (short for e Diskotheke)
r Domino* domino (piece)
s Domino (game)
r Dynamo* dynamo
r Eskimo* Eskimo
r Euro* euro
s Fiasko fiasco
r Flamingo* flamingo
s Foto photograph
s Kilo kilogram
s Kino cinema, movie theater
s Klo toilet, loo
r Kongo* the Congo (river)
s Konto account
e Kripo* cops, CID
r Limbo limbo
e Limo* soft drink, lemonade (short for e Limonade)
s Logo logo
s Lotto lottery
s Manko deficit
s Motto motto
r Öko Green (party member), tree-hugger
e Polio* polio, poliomyeltis
s Polo polo
r Popo* bottom, butt, heinie
s Porto postage
s Radio radio
r Realo* political realist
s Risiko risk, odds
s Rokoko Rococo (style, period)
r Saldo* balance (finan.)
r Salto* somersault, turn (gymn.)
r Scirocco* scirocco, a hot desert wind
e Soko* special police commission/unit
r Tacho* speedometer (short for r/s Tachometer)
r Techno* techno (music)
s Tempo speed
s Tempo® Tempo® (tissue), Kleenex®
r/s Toto* soccer/football pool, sports book
r Trafo* transformer (elec.)
s Tremolo tremolo
s Trio trio
s Ufo UFO (unidentified flying object)
e UNO* the UN (United Nations)
s Veto veto
s Video video
r Voodoo* voodoo
r Vopo* policeman (East Germany)
r Zoo* zoo
More on Gender > German Gender Hints:
• Gender Hints Introduction
• Gender Hints - DAS
• Gender Hints - DER
• Gender Hints - DIE
• Confusing Words in German