This is the 1222nd most frequent Russian word.
лучшие
"Лучшие" means "the best" in English.
Here, 'лучшие' is used as an adjective in its plural form to describe 'friends', indicating 'the best' or 'closest friends'.
Эти лучшие друзья всегда поддерживают друг друга.
These best friends always support each other.
In this sentence, 'лучшие' modifies 'фильмы', meaning 'the best' or 'most outstanding movies'.
Лучшие фильмы обычно выходят в конце года.
The best movies are usually released at the end of the year.
Here, 'лучшие' is used to describe 'качества', referring to 'the finest' or 'most positive qualities'.