Opportunity or possibility?

We use opportunity to talk about a situation in which we can do something that we want to do. Opportunity is most commonly followed by a verb in the to-infinitive form, or of + -ing form:

I had the opportunity to go to university when I was younger but I didn’t. Now I wish I had gone.

Not: I had the possibility …

A:

I’ve been waiting for an opportunity to talk to you privately. Are you free now?

B:

Yes. What is it about?

Not: … waiting for a possibility to …

This walk provides the opportunity of seeing some beautiful countryside.

We use possibility to talk about something that may happen or be true. Possibility is normally followed by of + noun phrase or of + -ing form, or by a that-clause:

I had never even thought of the possibility of working in the USA until I was offered a job there in 1998.

Not: … the possibility to work in the USA …

The possibility that there is life on other planets in the universe has always inspired scientists.