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 *srew-

→ English rhythm (root)
→ English logorrhea (derived)
→ English maelstrom (derived)
→ English arrhythmia (root)
→ English stream (root)
→ English stream (derived)
→ English rheumatism (root)
→ English rheum (root)
→ English catarrh (root)
→ English rheumatic (root)
→ English Salisbury (derived)
→ English endorheic (root)
→ English endorheic (derived)
→ English exorheic (root)
→ English -rrhea (root)
→ Old Church Slavonic строуꙗ (derived)
→ Welsh ffrwd (root)
→ Welsh ffrwd (derived)
→ Danish strøm (derived)
→ German Strom (root)
→ German Strom (mention)
→ Middle Dutch stroom (derived)
→ Greek ρεύμα (inherited)
→ Persian رود (mention)
→ Finnish Rauma (root)
→ Finnish rauma (root)
→ Faroese streymur (derived)
→ Irish sruth (derived)
→ Scottish Gaelic sruth (derived)
→ Ancient Greek ῥέω (mention)
→ Ancient Greek ῥύσις (suffix)
→ Ancient Greek ῥυθμός (mention)
→ Ancient Greek ῥεῦμα (derived)
→ Ancient Greek ῥοή (mention)
→ Ancient Greek ῥεῖθρον (derived)
→ Ancient Greek ῥόος (mention)
→ Ancient Greek ῥόθος (cognate)
→ Upper Sorbian trumjeń (derived)
→ Indonesian setrum (derived)
→ Icelandic straumur (mention)
→ Latin rumen (mention)
→ Latin frons (mention)
→ Latin fluo (derived)
→ Latin Roma (derived)
→ Lithuanian srovė (derived)
→ Lithuanian srūti (derived)
→ Latvian strauts (derived)
→ Latvian straujš (mention)
→ Norwegian Bokmål strøm (mention)
→ Norwegian Bokmål Tromsø (root)
→ Norwegian Bokmål Tromsø (mention)
→ Norwegian Bokmål Troms (root)
→ Norwegian Bokmål Troms (mention)
→ Norwegian Bokmål Troms og Finnmark (root)
→ Norwegian Bokmål Troms og Finnmark (mention)