The Proto-Semitic word ʾiš
Word ʾiš
Meaning fire

Comments
Kaye, Alan S. "Christopher Ehret. Reconstructing Proto-Afroasiatic (Proto-Afrasian): Vowels, Tone, Consonants, and Vocabulary", University of California 1995

Other words that might be of interest
nwr ‘light, to shine’, θ̣lm ‘black, darkness’, nīr, nūr ‘light’, nVgVh ‘shine’, ġarb ‘sunset, evening’, ṯ̣il(l) ‘shadow’, śamš ‘sun’