parathesis /pə-rathˈi-sis/

1. Apposition (grammar)
2. The compounding of words without change, as (Latin) rēspūblica from rēs and pūblica (philology)

• catatonic
• catatony
• catawba
• catawbas
• Catayan
• catbird
• catbirds
• catboat
• catboats
• cat-burglar
• cat-burglars
• catcall
• catcalled
• catcalling
• catcalls
• catch
• Catch-22
• catchable
• catch a crab
• catch-all
• catch-as-catch-can
• catch at
• catch at straws
• catch-basin
• catch-basins