remora /remˈə-rə/

1. The sucking-fish, formerly believed to stop ships by attaching its sucker
2. An obstacle (figurative)

• osp
• osprey
• ospreys
• OSS
• ossa
• ossarium
• ossariums
• ossein
• osseins
• osselet
• osselets
• osseous
• osseter
• osseters
• Ossi
• ossia
• Ossian
• Ossianesque
• Ossianic
• ossicle
• ossicles
• ossicular
• ossiferous
• ossific
• ossification