theoretical chemistry - What are similarities and differences among shells, orbitals, subshells, and energy levels?

I think I know what these terms mean:

• each row on the periodic table has a new shell of electrons,


• a subshell is e.g. 1s, 2s, 2p, 3s, 3p, etc.,


• and energy levels are the same as shells,


• whilst orbitals are the same as subshells.

Is this correct or totally wrong?