The Hittite word ḫar-ki-iš
Word ḫar-ki-iš
IPA ḫarki
Meaning white, bright
See also Homeric Greek: ἀργεννός ‘white’
Thracian: arzas ‘white’
Greek: άργιος ‘swift, fast, white’
Greek: αργέστης ‘shining, brilliant, white, bright’
Proto-Indo-European: *ar(e)-ĝ- ‘glittering, bright, white, fast’
Tocharian B: ārkwi ‘white’
Old Norse: hvítt ‘white’
Greek: ἀργηστής ‘glancing, flashing, white’

Other words that might be of interest
pa-aḫ-ḫur ‘fire’, ua-ar-ša ‘fog, mist’, ḫa-aš-ša-a- ‘fireplace, hearth’, ša-mi- ‘smoke’, ḫa-a-aš ‘ashes, dust, soap’, da-an-ku-iš ‘black, dark’, tuḫ-ḫu-iš ‘smoke, vapor’