As a noun arb
is (finance|trading) one who engages in arbitrage, an arbitrageur.
As an initialism arf is
acute renal failure.
arb
English
Initialism
(Initialism)
(head)
Angiotensin Receptor Blockers
Anagrams
*
*
*
arf
English
Interjection
Synonyms
* bow-wow, woof, woof-woof