Sometimes, accents are not marked as articulations, but rather as dynamics:

The fortepiano is performed by shifting from a strong to a soft dynamic, but without a real accent. The forte part lasts longer than in a regular accent, in order to clearly distinguish it.

The forzando indicates that the note it is attached to should be brassy or played forcefully within a soft dynamic.

The sforzando is an expressive accent (widely used in Romantic music) whose execution relies on the air speed. The resulting effect is like a quick crescendo–decrescendo that reinforces an important note.

The sforzato is a blend of the two previous dynamics. It is very powerful and brassy, but remains horizontal rather than vertical.