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 *pro-

→ English project (root)
→ English proverb (root)
→ English prove (mention)
→ English proven (mention)
→ English prostitute (root)
→ English profit (root)
→ English produce (root)
→ English proscribe (root)
→ English procrastinate (root)
→ English process (root)
→ English approach (derived)
→ English program (root)
→ English for- (root)
→ English for- (inherited)
→ English prophet (root)
→ English protest (root)
→ English pronounce (root)
→ English prosit (root)
→ English promulgate (root)
→ English purvey (root)
→ English provoke (root)
→ English fret (derived)
→ English protect (root)
→ English proceed (root)
→ English profligate (root)
→ English progress (root)
→ English propel (root)
→ English protrude (root)
→ English procreate (root)
→ English provide (root)
→ English proclaim (root)
→ English propose (root)
→ English promote (root)
→ English prominent (root)
→ English prorogue (root)
→ English promiscuous (root)
→ English prohibit (root)
→ English prolong (root)
→ English projection (root)
→ English profane (root)
→ Avestan 𐬟𐬭𐬀 (inherited)
→ Old English profian (derived)
→ Welsh rhag (derived)
→ Danish frem (mention)
→ Spanish proa (derived)
→ Fala por (derived)
→ French for- (derived)
→ Irish ros (derived)
→ Scottish Gaelic ros (derived)
→ Galician por (inherited)
→ Gothic 𐍆𐍂𐌰- (inherited)
→ Ancient Greek πρό (mention)
→ Hindi प्र- (derived)
→ Indonesian pra- (derived)
→ Indonesian pertama (derived)
→ Indonesian pratama (derived)
→ Italian probo (mention)
→ Kalasha práṣmik (prefix)
→ Latin pro (derived)
→ Latin protinus (derived)
→ Latin porro (mention)
→ Latin procerus (derived)
→ Latvian prāvs (cognate)
→ Norwegian Bokmål provocatus (derived)
→ Norwegian Bokmål abortus provocatus (derived)
→ Old Norse fram (derived)
→ Sanskrit प्रथम (derived)
→ Sanskrit प्रभु (root)
→ Sanskrit प्रभु (mention)
→ Sanskrit प्रभा (inherited)
→ Sanskrit प्रातर् (mention)
→ Old Irish ros (derived)
→ Old Irish ro- (derived)
→ Swedish pröva (derived)
→ Swedish för- (derived)
→ Old Armenian որոնեմ (mention)