i Register
In some senses, tyrant is marked as obsolete, historical. Watch for register when choosing this word.
ADJ
cruel, great
petty
The strict manager ruled the office like a petty tyrant, controlling every small decision.
VERB + TYRANT
overthrow
TYRANT + VERB
rule sth
A cruel tyrant ruled the island for nearly thirty years before the people finally rebelled.
PREP
under a/the ~
The citizens lived under a tyrant who controlled every aspect of their daily lives.