The Hittite word ḫa-aš-šu-
Word ḫa-aš-šu-
IPA ḫaššu-
Meaning king
See also Old Persian: a-u-ra ‘master, ruler’

Comments
ḫaššuššara 'queen'

Other words that might be of interest
iš-ḫa-aš-ša-ra ‘lady, mistress’, iš-ḫa-a-aš ‘master, lord, owner’