ei legevakt · emergency clinic, out-of-hours doctor
Feminine (ei)
Indefinite singular
ei legevakt
Definite singular
legevakta
Indefinite plural
legevakter
Definite plural
legevaktene
Feminine nouns (ei) can always be written with en as well: ei bok, boka or en bok, boken. Both are correct Bokmål.
How to guess the gender Nouns: gender and articles