supertype
A supertype is any of the parent types. It is the class that is extended, in a class definition, with the extends keyword; it also covers all the classes that are a supertype of that parent class.
The opposite is subtype.
<?php
// Agrandparent is a supertype of AChild
class Agrandparent {}
// Aparent is a supertype of AChild
class Aparent extends Agrandparent {}
class Achild extends Aparent{}
// These are not supertype of AChild
class ABrother extends Aparent{}
class ASister extends Aparent{}
?>