This is the 110th most frequent Bulgarian word.
нови
"New" (plural form).
Here, 'нови' describes 'предизвикателства', a plural noun, showing that the challenges are new.
Обичам нови предизвикателства в работата си.
I love new challenges in my work.
The word 'нови' is used as an adjective that modifies 'съседи', highlighting that the neighbors are recent or newly arrived.
Те имат нови съседи в сградата.
They have new neighbors in the building.
In this sentence, 'нови' is an adjective modifying the plural noun 'столове', indicating that the chairs are new.