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 *prew-

→ English frog (root)
→ English frosh (derived)
→ English frolic (root)
→ English frosk (derived)
→ Old English frosc (inherited)
→ Old English frocga (root)
→ German Freude (derived)
→ German Frosch (derived)
→ Middle English frogge (root)
→ Persian پریدن (inherited)
→ Faroese froskur (derived)
→ West Frisian froask (derived)
→ Icelandic froskur (derived)
→ Latvian prieks (mention)
→ Latvian prāvs (mention)
→ Latvian prāvs (mention)
→ Marshallese būro̧k (derived)
→ Norwegian Bokmål frosk (derived)
→ Dutch vors (derived)
→ Norwegian Nynorsk frosk (derived)
→ Old Norse froskr (derived)
→ Pennsylvania German Frosch (derived)
→ Russian прыгать (derived)
→ Sanskrit प्रवते (mention)
→ Sanskrit प्लव (mention)
→ Sanskrit प्लव (derived)
→ Yiddish פֿרייד (derived)
→ Yiddish פֿראָש (derived)