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 *bʰeydʰ-

→ English abide (root)
→ English federation (root)
→ English fealty (root)
→ English confidence (root)
→ English confident (root)
→ English Wi-Fi (root)
→ English infidel (root)
→ English faith (root)
→ English faith (mention)
→ English bide (root)
→ English bide (mention)
→ English defy (root)
→ English diffident (root)
→ English fiduciary (root)
→ English federal (root)
→ English confidential (root)
→ English fidelity (root)
→ English fidelity (mention)
→ English hi-fi (root)
→ English confidant (root)
→ English confidante (root)
→ English fiducial (root)
→ English diffidence (root)
→ English fideism (root)
→ English confide (root)
→ English infidelity (root)
→ English affidavit (root)
→ English affidavit (derived)
→ English lo-fi (root)
→ Old English bidan (root)
→ Old English abidan (root)
→ Old English bædan (root)
→ Old English bædan (derived)
→ Catalan fe (derived)
→ Czech běda (derived)
→ Czech bída (derived)
→ Old Church Slavonic бѣда (inherited)
→ Danish bie (root)
→ Middle Dutch biden (root)
→ Spanish fe (derived)
→ Faroese bíða (root)
→ Faroese bíða (inherited)
→ French foi (derived)
→ French bidon (mention)
→ French bedeau (derived)
→ Old High German bita (root)
→ Gothic 𐌱𐌴𐌹𐌳𐌰𐌽 (root)
→ Gothic 𐌱𐌰𐌹𐌳𐌾𐌰𐌽 (root)
→ Gothic 𐌲𐌰𐌱𐌰𐌹𐌳𐌾𐌰𐌽 (root)
→ Gothic 𐌲𐌰𐌱𐌴𐌹𐌳𐌰𐌽 (root)
→ Ancient Greek πίστις (root)
→ Ancient Greek πίστις (inherited)
→ Ancient Greek πείθω (root)
→ Ancient Greek πιθανός (root)
→ Ancient Greek πιστός (root)
→ Ancient Greek πεῖσις (root)
→ Ancient Greek ἄπιστος (root)
→ Ancient Greek ἀπιστέω (root)
→ Ancient Greek πίστευσις (root)
→ Ancient Greek ἀπίστως (root)
→ Icelandic bíða (root)
→ Icelandic beiða (root)
→ Italian fiducia (root)
→ Italian federare (root)
→ Italian fedele (root)
→ Italian infedele (root)
→ Italian infedeltà (root)
→ Italian fedeltà (root)
→ Italian fede (root)