This is the 3732nd most frequent Catalan word.
adolescent
A young person in the stage of development between childhood and adulthood; a teenager.
The word 'adolescent' is used as an adjective to describe the noun 'noia' (girl), indicating her life stage.
La noia adolescent estudia a l'institut.
The adolescent girl studies in the high school.
Here, 'adolescent' acts as a noun, referring to a young person in the adolescent stage of life.
Un adolescent sovint té molts dubtes sobre el futur.
An adolescent often has many doubts about the future.
In this case, 'adolescents' is an adjective modifying 'comportaments' (behaviors), characterizing them as typical of adolescence.