1. Were not

Encyclopedia: Weren't

• River Adige
• River Aire
• River Arno
• River Avon
• river basin
• river birch
• river blindness
• river boat
• river bottom
• river boulder
• River Cam
• River Cocytus
• river cooter
• river dolphin
• river gum
• river horse
• River Kasai
• River Lethe
• river limpet
• river otter
• river pear
• river prawn
• river red gum
• River Severn
• river shad