The Old Norse word reykr
Word reykr
r e k r
Meaning smoke, steam

Other words that might be of interest
eisa ‘fire’, eldr ‘fire’, aska ‘ashes’, skírr ‘clear, bright’, døkkr ‘dark’, dimmar ‘dark, gloomy’, myrkr ‘dark, murky’, dimma ‘darkness’, logi ‘flame, blaze’, heitr ‘hot, burning’, skuggi ‘shadow’, sól ‘sun’, sunna ‘sun’