This is the 59th most frequent French word.
fin
"Fin" means "end" in English.
Here, 'fin' is used as a noun meaning 'end' or 'conclusion'.
La fin du film était émouvante.
The end of the movie was moving.
Here, 'fin' is used metaphorically in a noun sense to mean 'termination' or 'resolution of a situation.'
Pourriez-vous mettre une fin à cette dispute?
Could you put an end to this argument?
In this context, 'fin' again acts as a noun, indicating the conclusion or completion of something, namely a project in this case.