v. to be, infinitive form
n. being, the state of being (something)

Paaz Keizaal fen kos stin nol bein Alduin jot, Dovahkiin kos fin saviik do muz!
Fair Skyrim will be free from foul Alduin's maw, Dragonborn be the savior of men!
(Book, Songs of Skyrim)

Skuldafn fen kos dinok.
Skuldafn will be your death.
(Dragon, 000E1704)

Het nok brit kaaz Anurassa, wen faad nis kos evenaar orin naal Krah dinok.
Here lies the beautiful cat Anurassa, whose warmth cannot be extinguished even by the Cold of death.
(Word Wall for Krah, Frost Breath)

Only verb in the language that conjugates according to tense. Kos is infinitive and used either in the imperative (kos kril ‘be brave’) or with modal verbs (zu’u fen kos brave ‘I will be brave’).