This is the 6669th most frequent Russian word.
novus
The word "novus" is not Russian; it is Latin and means "new."
Here, 'novus' is used as a noun, referring to the name of a specific game.
Он изучает правила игры новус.
He is studying the rules of the novus game.
In this sentence, 'novus' remains a noun, continuing its role as a proper noun referring to the game.
Последний ход в партии новус был решающим.
The final move in the novus match was decisive.
Here, 'novus' functions as the subject of the sentence, again indicating the name of the game.