Nature

moon

Source:*měsęcьProto-Slavic · “moon, month”certain

*měsęcь meant both 'moon' and 'month'; Czech, BCS and Ukrainian kept both senses, Russian and Polish split them between two words.

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English

moon

Polish

księżyc

ˈkɕɛ̃ʐɨts

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In all five languages

BCS script

Latin under Cyrillic

Russian
луна́luna
luˈnadifferent word · Proto-Slavic *luna 'moon, glow'
Russian месяц is the crescent moon, and also 'month'.
Ukrainian
мі́сяцьmisjacʹ
ˈmʲisʲatsʲinherited
Ukrainian луна means 'echo', not 'moon'.
Polish
księżyc
ˈkɕɛ̃ʐɨtsdifferent word · Polish, from ksiądz 'prince' (originally 'prince's son')
Polish miesiąc, the cognate, means only 'month'.
Czech
měsíc
ˈmɲɛsiːtsinherited
Also 'month'.
Bosnian-Croatian-Serbian
mjesec / mesecмјесец / месец
ˈmjesetsinherited
Also 'month'.
English
moon
Distant English relative — Moon, month and *měsęcь share an Indo-European root for the moon as the measurer of time.