As nouns the difference between roarer and rearer
is that roarer is one who roars while rearer is one who (nurtures children or animals).
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
rearer
English
Noun
(
en noun)
One who (nurtures children or animals).
A horse or other animal that rears up.