pep

As a noun taxonomy

is the science or the technique used to make a classification.

As an initialism pep is

post-exposure prophylaxis.

Prep is a related term of pep.

As initialisms the difference between prep and pep

is that prep is (emergency medicine) initialism of pre-exposure prophylaxis while pep is post-exposure prophylaxis.

Phosphoenolpyruvate is a synonym of pep.

As nouns the difference between pep and phosphoenolpyruvate

is that pep is energy, high spirits while phosphoenolpyruvate is an important intermediate in glycolysis and gluconeogenesis, having the chemical formula C₃H₅O₆P.

As a verb pep

is to inject with energy and enthusiasm.

As an initialism PEP

is post-exposure prophylaxis.