This is the 7576th most frequent Catalan word.
biòleg
Biòleg: Biologist.
Here, 'biòleg' is a subject noun referring to a professional scientist.
El biòleg estudia les plantes al laboratori.
The biologist studies the plants in the laboratory.
In this case, 'biòleg' is used as a career aspiration noun.
La meva amiga vol ser biòleg en el futur.
My friend wants to be a biologist in the future.
Here, 'biòloga' is the feminine form of 'biòleg', denoting a female professional in biology.