biller is the feminine plural indefinite of bille.

billeN

Kven

kiiskiN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:35205Edit on GitHub Suggest

gobbáN; goppásN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:67344Edit on GitHub Suggest

Case	Sg	Pl
Indef	bille	biller
Def	billen / billa	billene