Of course the best way is to memorize the “die” as a part of the word. However, there may be cases where you just might not be sure. Here are some noun endings that may indicate that the noun is feminine. I just want to clarify that this isn’t 100% true in all cases, but it’s a good guideline.

-heit : die Freiheit (freedom)

-keit : die Müdigkeit (tiredness)

-tät : die Universität (university)

-ung : die Zeitung (newspaper)

-schaft : die Erbschaft (inheritance)

-ie : die Geographie (geography)

-ik : die Musik (music)

-ei : die Wäscherei (laundry)

-enz : die Frequenz (frequency)

-anz : die Toleranz (tolerance)

-ion : die Kommunikation (communication)

-a : die Pizza (pizza)

-e : die Seuche (epidemic)

-ur : die Konjunktur (economic trend)

-in : die Studentin (student) The “in” is a common feminine noun ending. It indicates female people, occupations and nationalities.