-in die
Kellnerin
Always 99.4% of the 471 common nouns ending in -in take die.
Add -in to a man's job or nationality and you get a woman: der Lehrer, die Lehrerin. Always feminine.
Exceptions der Muffin
die Kellnerin
It's die Kellnerin. Kellnerin is feminine, plural die Kellnerinnen.
Die Kellnerin ist freundlich.
The waitress is friendly.
Kellnerin
Always 99.4% of the 471 common nouns ending in -in take die.
Add -in to a man's job or nationality and you get a woman: der Lehrer, die Lehrerin. Always feminine.
Exceptions der Muffin