United Free Church 
A Presbyterian Church in Scotland formed in 1900 by the union of the Free Church of Scotland with the United Presbyterian Church. In 1929 the majority of its congregation joined the established Church of Scotland.
- pyrus
- pyruvate
- pyruvate kinase
- pyruvate oxidase
- pyruvic acid
- pyruvic aldehyde
- pyruvic kinase
- pyruvic oxidase
- pysanka
- pysanky
- Pytchley
- Pytchley coat
- Pytchley Hunt
- Pythagoras
- Pythagoras' theorem
- Pythagorean
- Pythagorean comma
- Pythagoreanise
- Pythagoreanism
- Pythagoreanize
- Pythagorean letter
- Pythagorean lyre
- Pythagorean number
- Pythagorean proposition
- Pythagorean system