Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Proto-Indo-European *h₂erh₃-

→ English ear (inherited)
→ Old English eard (derived)
→ Old English erian (derived)
→ Czech orat (derived)
→ Czech orba (derived)
→ Old Church Slavonic орати (derived)
→ Welsh erw (root)
→ Welsh erw (inherited)
→ Welsh aradr (root)
→ Welsh aredig (root)
→ Welsh aredig (mention)
→ Spanish arar (mention)
→ Irish ar (root)
→ Irish arbhar (root)
→ Irish arathar (root)
→ Galician cómaro (derived)
→ Galician aramio (root)
→ Galician aramio (derived)
→ Ancient Greek ἀροτήρ (root)
→ Ancient Greek ἀρόω (root)
→ Ancient Greek ἀρόω (mention)
→ Ancient Greek ἄροτρον (root)
→ Ancient Greek ἄροτρον (suffix)
→ Ancient Greek ἄρουρα (root)
→ Ancient Greek ἄρουρα (inherited)
→ Italian arare (mention)
→ Komi-Permyak гӧрны (cognate)
→ Latin area (mention)
→ Latin aro (root)
→ Latin aro (mention)
→ Latin Albanus (mention)
→ Latin arvus (root)
→ Lithuanian arti (root)
→ Lithuanian arklys (root)
→ Lithuanian arklas (root)
→ Lithuanian arklas (mention)
→ Lithuanian armuo (root)
→ Latvian art (mention)
→ Latvian arkls (mention)
→ Old Norse arðr (root)
→ Old Norse erja (root)