I suppose at a rather young age I got to like the -ology suffix on words; it seems to be everywhere. It roughly means “-the study of X”. This page is a stub to point you to the original for the tongue twister and to other possibly useful pages.
Peter Piper, representative of the letter “p”, is found below. The image and tongue twister are from Peter Piper’s Practical Principles of Plain and Perfect Pronunciation by John Harris. The version used here was published in 1836.
Peter Piper picked a peck of pickled Peppers:
Did Peter Piper pick a peck of pickled Peppers?
If Peter Piper picked a peck of pickled Peppers,
Where’s the peck of pickled Peppers Peter Piper picked?