Learn French: Bonsoir et bonne soirée ! - Good evening and have a nice evening!

Bonsoir is used as a greeting when you arrive somewhere or meet someone in the evening, just like saying 'Hello' or 'Good evening'. Bonne soirée is used when you are leaving, to wish someone a good rest of their evening, like saying 'Have a good evening!'.

Why is it bon in the first word but bonne in the second phrase?

In French, adjectives must match the gender of the noun. The word soirée is feminine, so it takes the feminine adjective bonne. The greeting bonsoir is actually the masculine adjective bon combined with the masculine noun soir.

Is there a difference between the nouns soir and soirée?

Yes! Both mean 'evening', but soir simply refers to the time of day. Soirée emphasizes the entire duration or the experience of the evening. That is why you use soirée when wishing someone a good time for the whole evening.

Why aren't bonne and soirée combined into one word like bonsoir?