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 *h₃reǵ-

→ English adroit (root)
→ English regime (root)
→ English right (root)
→ English right (mention)
→ English rake (root)
→ English rake (derived)
→ English rake (derived)
→ English rake (derived)
→ English rake (derived)
→ English correct (root)
→ English real (root)
→ English rectangle (root)
→ English source (root)
→ English source (mention)
→ English alright (root)
→ English regicide (root)
→ English aright (root)
→ English royal (root)
→ English rule (root)
→ English rule (mention)
→ English rank (derived)
→ English realm (root)
→ English rich (root)
→ English rich (derived)
→ English region (root)
→ English rector (root)
→ English regiment (root)
→ English regal (root)
→ English upright (root)
→ English anorexia (root)
→ English regalia (root)
→ English regional (root)
→ English resource (root)
→ English riche (root)
→ English riche (derived)
→ English surge (root)
→ English surge (mention)
→ English rectum (root)
→ English uprighteous (root)
→ English righteous (root)
→ Old English racu (derived)
→ Old English racu (derived)
→ Old English racian (root)
→ Old English racian (derived)
→ German reich (derived)
→ German rechnen (mention)
→ Middle English riche (root)
→ Middle English riche (derived)
→ Middle English riken (derived)
→ Persian راست (mention)
→ Faroese ríkur (derived)
→ Faroese rættur (derived)
→ French riche (root)
→ French riche (derived)
→ French rectification (root)
→ Middle French riche (root)
→ Middle French riche (derived)
→ Middle French prerogatif (mention)
→ Old French riche (root)
→ Old French riche (derived)
→ Irish éirigh (root)
→ Irish éirigh (derived)
→ Irish athraigh (root)
→ Irish athraigh (inherited)
→ Irish reachtaíocht (root)
→ Irish reachtaigh (root)
→ Irish reachtach (root)
→ Scottish Gaelic rach (root)
→ Scottish Gaelic èirich (root)
→ Scottish Gaelic èirich (derived)
→ Scottish Gaelic atharraich (root)
→ Scottish Gaelic atharraich (inherited)
→ Old High German rahha (derived)
→ Gothic 𐍂𐌴𐌹𐌺𐌹 (root)
→ Ancient Greek Ῥῆσος (derived)
→ Ancient Greek ὀρέγω (root)
→ Ancient Greek ὀρεκτός (root)
→ Ancient Greek ὀρεκτός (mention)
→ Ancient Greek ὀρεκτικός (root)
→ Ancient Greek ἀρήγω (derived)