1. Equal, comparable, similar:
* Parallel: Running alongside and always the same distance apart.
* Parity: Equality, equivalence, being equal.
* Compare: To examine two things to see how they are alike or different.
* Paragon: A model of excellence or perfection.
* Parameter: A numerical or other measurable factor that defines a system or sets the conditions of its operation.
2. Part, divide:
* Separate: To set or keep apart; divide.
* Partition: To divide into parts.
* Partial: Affecting only a part; not complete or total.
3. Appear, become visible:
* Appear: To come into sight; become visible.
* Transparent: Allowing light to pass through so that objects behind can be seen clearly.
4. Giving birth, producing:
* Parent: A father or mother.
* Parenthood: The state of being a parent.
* Parthenogenesis: Reproduction from an ovum without fertilization.
This is not an exhaustive list, but it gives you an idea of the diverse words that incorporate the root "par."