koffeiner is the neuter plural indefinite of koffein.

koffeinN

North Sámi

koffeiidnaN

Norsk-nordsamisk ordbokdict-nob-sme/src/N_nobsme.xml:1899Edit on GitHub Suggest

Case	Sg	Pl
Indef	koffein	koffeiner
Def	koffeinet	koffeinene