This is the 58th most frequent Swedish word.
ny
"Ny" means "new" in English.
The word 'nya' is the definite form of 'ny', used to match 'vän' (friend), which is definite because of the possessive 'min' (my).
Hon är min nya vän.
She is my new friend.
The word 'nytt' is the neuter form of 'ny', matching the neuter singular noun 'hus' (house).
De byggde ett nytt hus.
They built a new house.
The word 'ny' is used as an adjective meaning 'new', describing the noun 'bok' (book). Here, it takes the basic form to match a singular, en-gender noun.