Later on and Preexistent

Later on adverb - Happening at a time subsequent to a reference time.

Preexistent and later on are semantically related. In some cases you can use "Preexistent" instead an adjective phrase "Later on".

Preexistent adjective - Existing previously or before something.

Later on and preexistent are semantically related. Sometimes you can use "Later on" instead an adjective "Preexistent".