Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Welsh -us
← Proto-Brythonic *-ʉs (derived)
← Cornish -us (cognate)
← Latin -ōsus (derived)
← Middle Welsh -us (inherited)

→ Welsh lwcus (affix)
→ Welsh campus (affix)
→ Welsh cariadus (affix)
→ Welsh nerfus (affix)
→ Welsh barus (affix)
→ Welsh anffodus (suffix)
→ Welsh cyffrous (affix)
→ Welsh cyhoeddus (affix)
→ Welsh gofalus (affix)
→ Welsh dirmygus (affix)
→ Welsh cyfleus (affix)
→ Welsh pryderus (affix)
→ Welsh trychinebus (affix)
→ Welsh gwyliadwrus (affix)
→ Welsh hyderus (affix)
→ Welsh adnabyddus (affix)
→ Welsh moethus (affix)
→ Welsh medrus (affix)
→ Welsh anrhydeddus (affix)
→ Welsh crefftus (affix)
→ Welsh trachwantus (affix)
→ Welsh grymus (affix)
→ Welsh iachus (affix)
→ Welsh bregus (affix)
→ Welsh cellweirus (affix)
→ Welsh hoenus (affix)
→ Welsh athrodus (affix)
→ Welsh arswydus (affix)
→ Welsh brawychus (affix)
→ Welsh echrydus (affix)
→ Welsh cynhennus (affix)
→ Welsh cecrus (affix)
→ Welsh helbulus (affix)
→ Welsh trafferthus (affix)
→ Welsh trwblus (affix)
→ Welsh llwyddiannus (suffix)
→ Welsh adfydus (affix)
→ Welsh blasus (suffix)
→ Welsh gweddus (affix)
→ Welsh golygus (compound)