This is the 865th most frequent Norwegian word.
vipers
The Norwegian word "vipers" does not exist; it might be a misunderstanding or misspelling.
Here, 'vippende' (similar to 'vipers' in spelling in English) is a participle describing a tilting or tipping motion, presenting different usage or similarity in spelling.
Han gjemte seg vippende bak døren for å overraske vennen sin.
He hid tipping behind the door to surprise his friend.
Here, 'Viper' is used as a proper noun, possibly referring to a specific model of airplane or vehicle.
Viperflyet hadde en utrolig manøvreringsevne.
The Viper plane had an incredible maneuverability.
Here, 'viper' is used as a noun, referring to the snake species.