This is the 9072nd most frequent Spanish word.
vivobook
"Vivobook" is not a Spanish word; it is a brand name for ASUS laptops.
In this sentence, 'Vivobook' functions as a proper noun, specifically the brand and model name of a laptop.
Compré un Asus Vivobook para mi trabajo.
I bought an Asus Vivobook for my work.
Here, 'Vivobook' is used again as a proper noun, referring to the specific item owned by the speaker's friend.
El Vivobook que tiene mi amigo es muy rápido.
The Vivobook that my friend has is very fast.
In this example, 'Vivobook' continues to act as a proper noun, denoting a desired brand of laptop.