Nature

forest, woods

Source:*lěsъProto-Slaviccertain

Polish las is the clearest case of ě becoming a before a hard consonant (compare the plural lasy, but 'in the forest' w lesie).

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English

forest, woods

Polish

las

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In all five languages

BCS script

Latin under Cyrillic

Russian
лесles
lʲesinherited
Ukrainian
лісlis
lʲisinherited
Polish
las
lasinherited
Czech
les
lɛsinherited
Bosnian-Croatian-Serbian
šumaшума
ˈʃumadifferent word · South Slavic, of uncertain origin
English
forest, woods