What is the difference between an Esplanade and a Promenade? Both words are used in Lowestoft with "esplanade" now the designation for a row of terraces. "Wellington Esplanade" is the official address for Wellington Terrace. Typically, we now say we walk on the Prom and live in the Esplanade.
A Promenade is, according to the Oxford dictionary, (noun) "A paved public walk, typically one along the seafront at a resort, or (verb) Take a leisurely public walk, ride, or drive so as to meet or be seen by others."
An Esplanade (noun) is "A long, open, level area, typically beside the sea, along which people may walk for pleasure."
So you can see, there is no difference and both words refer to the long wide pedestrian walkway, most often by the sea. Wellington Esplanade is really (if you want to get technical about it) the wide walkway in front of Wellington Terrace. The Prom is the paved public path that stretches from the Royal Plain to Kensington Gardens. At the northern end of town, the North Prom is less developed, but is exactly the same thing- a paved path by the sea, used for leisurely strolls and to see and be seen.
See?