The Avestan word caθβarasca
Word caθβarasca
Meaning four
See also Homeric Greek: τέσσαρες ‘four’
Latin: quattuor ‘four’
Illyrian: *katar ‘four’
Proto-Indo-European: *kʷetwóres ‘four’
Proto-Celtic: *kʷetru ‘four’
Sanskrit: catvā́ras ‘four, 4’

Other words that might be of interest
aēuua ‘one’, ašta ‘eight, 8’, xšuuaš ‘six, 6’, θritiia- ‘third’, paoiriia- ‘first’, paṇca ‘five, 5’, bitiia- ‘second’, hapta ‘seven, 7’