Next vs Continue vs Proceed

I have a situation in my current design. The application I'm looking at has four vertical sections which are continual, i.e. completing section 1 leads to 2 and so on. Now, section one has two steps. The user fills in the step one of section two, says continue and the user is taken to step two. After completing step two of section one as well, he should go to the section two.

In this tricky situation, what button titles should I give to the following: 1. Button that takes the user to next step within a section 2. Button that takes the user to the next section

Please let me know your thoughts!