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 *h₂ḱrós

→ English acrimonious (cognate)
→ Czech ostrý (derived)
→ Lower Sorbian wótšy (inherited)
→ Greek άκρη (inherited)
→ Spanish agrio (derived)
→ French aigre (derived)
→ French aigre (derived(fr/fro))
→ Irish aichear (derived)
→ Ancient Greek ἄκρος (inherited)
→ Ancient Greek ἄκορον (derived)
→ Ancient Greek ἄκορος (derived)
→ Italian agro (derived)
→ Latin acer (derived)
→ Lithuanian aštrus (inherited)
→ Latvian agrs (mention)
→ Old Norse ǫgr (derived)
→ Oscan 𐌀𐌊𐌓𐌉 (inherited)
→ Polish ostry (mention)
→ Portuguese acre (derived)
→ Romanian acru (derived)
→ Russian острый (inherited)
→ Old Irish gér (derived)
→ Old Irish aicher (derived)
→ Serbo-Croatian oštar (derived)
→ Serbo-Croatian оштар (derived)
→ Serbo-Croatian oštro (derived)
→ Slovene oster (derived)
→ Albanian acar (derived)