Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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English decay
English decadent (mention)
English decadence (mention)
Middle English decayen (inherited)
Middle English dekeyen (mention)
Proto-Indo-European *ḱh₂d- (root)
Latin dēcidō (derived)
Latin de (mention)
Latin cadō (mention)

English taint (link)
English decadence (mention)
English decaying (suffix)
English decayeth (suffix)
English decayer (suffix)
English decayless (suffix)
English decayable (suffix)
English predecay (prefix)
English photodecay (prefix)
English biodecay (prefix)
English decayability (suffix)
English decadescent (suffix)
Welsh diciâu (borrowed)
Japanese ディケイ (borrowed)
Norwegian Nynorsk forfall (link)
Portuguese queda (link)