As nouns the difference between roamer and roarer
is that roamer is one who roams while roarer is one who roars.
roarer
English
Noun
(
en noun)
One who roars.
(archaic) One of a group of young men who would carouse in taverns, then pick brawls on the street for entertainment.
Synonyms
* (young man who picks brawls) roaring boy