choler, enmity, temper, rankle
Exasperation.
One three letter word relating to anger and ending with O is ego.
anger
Anger
The definition of the word 'annoyance' is the feeling of being irritated. Some synonyms for this word would be anger, irritation, unhappiness, and frustration.
The word derived from anger is "agitation." It captures the emotional state of being disturbed or upset, often as a result of anger. Other related terms include "irritation" and "fury," which also convey varying intensities of anger. Each of these words highlights different aspects or responses associated with the feeling of anger.
ire
enraged
scorn, anger
rage
Vent could mean release anger.
stressed i think