The Thracian word achel-
Word achel-
Meaning water
See also Phrygian: ΑΚΑΛΑ ‘water’
Greek: αχελώος ‘name of a river, water’
Synonyms iuras, mar, opa

Other words that might be of interest
ala ‘current, stream’, alta ‘current, stream’, arma ‘swamp’, ars ‘to flow’, arta(s) ‘river’, e(i)b ‘to flow’, kaba(s) ‘bog, swamp’, kalsas ‘dry, dried up’, ostas ‘river mouth’, pala ‘swamp’, sara ‘river’, sind(u)- ‘river’, strumon ‘river’, krisos ‘river name’