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 *h₁rewdʰ-

→ English red (root)
→ English red (mention)
→ English russet (root)
→ English russet (cognate)
→ English ruby (root)
→ English erythrocyte (root)
→ English rust (root)
→ English rust (derived)
→ English rouge (root)
→ English roux (root)
→ English rufous (root)
→ English redden (root)
→ English robust (root)
→ English rubicund (root)
→ English corroborate (root)
→ English Roy (derived)
→ English erythema (root)
→ English Rufus (root)
→ English rubella (root)
→ English rubella (derived)
→ English rowan (root)
→ English Rubicon (root)
→ English Rubicon (derived)
→ English Roth (root)
→ English corroborator (root)
→ English reddish (root)
→ English raddle (root)
→ English rutilant (root)
→ English rutilant (derived)
→ English rubric (root)
→ English rubric (derived)
→ English redness (root)
→ English ruddiness (root)
→ English rubasse (root)
→ English rubicon (root)
→ English rubicon (derived)
→ English corroborative (root)
→ English ruddle (root)
→ English reddle (root)
→ English rud (root)
→ Afrikaans rooi (mention)
→ Old English read (mention)
→ Old English reodan (root)
→ Old English reod (mention)
→ Breton ruz (inherited)
→ Catalan ros (derived)
→ Corsican rossu (inherited)
→ Czech ryzí (root)
→ Welsh rhudd (inherited)
→ Danish rust (root)
→ Danish rød (derived)
→ German rot (root)
→ German rot (mention)
→ German robust (root)
→ German Rot (root)
→ German Rost (root)
→ German Rost (mention)
→ German Rubin (root)
→ German Rotkehlchen (root)
→ German rötlich (root)
→ German Rotwein (root)
→ German erröten (root)
→ German rostig (root)
→ German rothaarig (root)
→ German rostfrei (root)
→ German Erythem (root)
→ German Röteln (root)
→ German Robustheit (root)
→ German rosten (root)
→ German feuerrot (root)
→ German nichtrostend (root)
→ German verrosten (root)
→ German Rostschutz (root)
→ German Erythrozyt (root)
→ German Röte (root)
→ German Rubrik (root)
→ German Rubrik (derived)
→ German erythematös (root)
→ German rostbraun (root)
→ German rostrot (root)