Words that come from Proto-Indo-European ḱesn-

8 words across 5 languages descend from Proto-Indo-European ḱesn- — including сосна, сосна, sosna, Sosnowiec, sosnowy, Sosnowy, sosna, сосна.

See the etymology of ḱesn- itself →

Polish (4)

Russian (1)

Ukrainian (1)

Proto-Slavic (1)

Old East Slavic (1)