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 *h₃ep-

→ English manure (root)
→ English omnibus (root)
→ English omnibus (mention)
→ English operator (root)
→ English opus (root)
→ English copy (root)
→ English copious (root)
→ English cornucopia (root)
→ English office (root)
→ English opera (root)
→ English official (root)
→ English opulence (root)
→ English officer (root)
→ English operate (root)
→ English officiate (root)
→ English officious (root)
→ English omnipotent (root)
→ English omniscient (root)
→ English opulent (derived)
→ English magnum opus (root)
→ English operational (root)
→ English omnivore (root)
→ English Oscan (mention)
→ English Osci (root)
→ English opuscule (root)
→ English omni- (root)
→ English magnoperate (root)
→ English magnoperate (derived)
→ Irish obair (derived)
→ Scottish Gaelic obair (derived)
→ Mycenaean Greek 𐀃𐀞 (derived)
→ Ancient Greek ὄμπνη (derived)
→ Italian ogni (root)
→ Italian ogni (mention)
→ Italian copia (root)
→ Italian ufficio (mention)
→ Italian scopiazzare (root)
→ Latin opus (root)
→ Latin opus (mention)
→ Latin omnis (root)
→ Latin omnis (mention)
→ Latin optimus (derived)
→ Latin ops (root)
→ Latin ops (mention)
→ Latin officium (root)
→ Latin caupo (mention)
→ Latin obsidianus (derived)
→ Latin omnivorus (root)
→ Latin अपस् (root(la/sa))
→ Norwegian Bokmål evne (root)
→ Norwegian Bokmål evne (mention)
→ Norwegian Bokmål offiser (root)
→ Norwegian Bokmål offiser (mention)
→ Norwegian Bokmål ABC-offiser (root)
→ Norwegian Bokmål ABC-offiser (mention)
→ Norwegian Bokmål abc-offiser (root)
→ Norwegian Bokmål abc-offiser (mention)
→ Norwegian Bokmål absorberingsevne (mention)
→ Norwegian Bokmål absorpsjonsevne (mention)
→ Norwegian Bokmål abstraksjonsevne (mention)
→ Old Norse efni (root)
→ Old Norse afl (root)
→ Old Norse efna (root)
→ Norman ouvrer (mention)
→ Portuguese ótimo (derived)
→ Sanskrit स्वपस् (mention)
→ Sanskrit अपस् (mention)
→ Albanian punë (mention)