choler, enmity, temper, rankle
Hate, Rage.
Ire.
ire
Irk ? Bug ?
mad
Exasperation.
One three letter word relating to anger and ending with O is ego.
The definition of the word 'annoyance' is the feeling of being irritated. Some synonyms for this word would be anger, irritation, unhappiness, and frustration.
anger
Anger
enraged
ire
rage
scorn, anger
Vent could mean release anger.
enraged
Wrath.