vs
QUICK ANSWER
"Último" is a form of "último", an adjective which is often translated as "last". "Por último" is a phrase which is often translated as "finally". Learn more about the difference between "por último" and "último" below.
por último()
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (adverbial)
último()
An adjective is a word that describes a noun (e.g., the big dog).