How do you say help in Spanish?

It depends on what you want to say.

The verb "to help" in Spanish is "ayudar".

If you are referring to the noun of "help", (I need a little help with this.) this would be "ayuda".

If you are referring to the exclamation a person in danger would make, (Help! The fire is coming!) this would be "socorro".

If you are referring to an employee in housekeeping or catering, (If only the help arrived on time!), this would be, "asistencia".