The Hittite word ḫe-e-u-
Word ḫe-e-u-
IPA ḫēu
Meaning rain
See also Homeric Greek: αἰονάω ‘moisten, foment’
Proto-Anatolian: *Háiʔus ‘rain’

Other words that might be of interest
ua-a-tar ‘water’, wa-a-tar ‘water’, lu-li-iš ‘pond, lake, spring, well, basin’, a-ru-na- ‘sea’, e-kan ‘cold, frost, ice’, ḫa-pa-aš ‘river’