The Bible often uses specific words to convey precise meaning. Notice the subtle shift in language when describing Abimelech's rule.
In Judges 9:6, the text uses a verb that implies being made king, a more formal coronation. But in verse 22, a different verb is used, often translated as 'ruled' or 'governed.' Scholars note this word can carry a sense of despotism or simply exercising control, rather than a divinely sanctioned kingship.
This linguistic nuance highlights a crucial point: Abimelech's reign was not a legitimate, accepted kingship over all Israel. It was more of a regional dominance, an illegitimate grip on power that the people, at least initially, tolerated because they desired a kingly figure.
His 'rule' was built on violence and deceit, not on God's appointment or the genuine consent of the entire nation. It was a precarious hold, recognized more by the surrounding towns that submitted than by a unified Israel.