despotyoudaoicibaDictYouDict
despot: [16] The ultimate source of despot is Greek despótēs ‘lord’. It is related to Sanskrit dampati ‘master of the house’, and both probably go back to an Indo-European compound formed from *domo- ‘house’ (source of Latin domus ‘house’, and hence of English domestic) and another element related to Latin potis ‘able’ and English power. (Latin dominus ‘lord’, a derivative of domus ‘house’ and originally meaning ‘master of the house’, is a semantically parallel formation.) Greek despótēs was used for ‘lord, master’ or ‘ruler’ in various contexts, with no particular pejorative connotation (in modern Greek it means ‘bishop’).

But most rulers in ancient times enjoyed absolute power, and so eventually the word (which entered English via medieval Latin despota and early modern French despot) came to mean ‘tyrannical ruler’; this sense became firmly established at the time of the French Revolution.
=> domestic, dominion
dictator (n.)youdaoicibaDictYouDict
late 14c., from Latin dictator, agent noun from dictare (see dictate (v.)). Transferred sense of "one who has absolute power or authority" in any sphere is from c. 1600. In Latin use, a dictator was a judge in the Roman republic temporarily invested with absolute power.
monarchy (n.)youdaoicibaDictYouDict
"state ruled by monarchical government," mid-14c.; "rule by one person," late 14c.; from Old French monarchie "sovereignty, absolute power" (13c.), from Late Latin monarchia, from Greek monarkhia "absolute rule," literally "ruling of one," from monos "alone" (see mono-) + arkhein "to rule" (see archon).
omnipotent (adj.)youdaoicibaDictYouDict
early 14c., from Old French omnipotent "almighty, all-powerful" (11c.) or directly from Latin omnipotentem (nominative omnipotens) "all-powerful, almighty," from omnis "all" (see omni-) + potens (genitive potentis) "powerful" (see potent). Strictly only of God or a deity; general sense of "having absolute power or authority" is attested from 1590s.
tyranny (n.)youdaoicibaDictYouDict
late 14c., "cruel or unjust use of power; the government of a tyrant," from Old French tyranie (13c.), from Late Latin tyrannia "tyranny," from Greek tyrannia "rule of a tyrant, absolute power," from tyrannos "master" (see tyrant).