The Proto-Semitic word θ̣lm
Word θ̣lm
Meaning black, darkness
Synonyms cwd, θ̣hr

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’, nīr, nūr ‘light’, nVgVh ‘shine’, ġarb ‘sunset, evening’, ṯ̣il(l) ‘shadow’, ʾiš ‘fire’, śamš ‘sun’