remora /remˈə-rə/

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

• gallows-free
• gallows humour
• gallows humours
• gallows-lee
• gallows-lees
• gallows-maker
• gallows-makers
• gallowsness
• gallowsnesses
• gallows-ripe
• gallows-tree
• gallows-trees
• galls
• gall-sickness
• gallsickness
• gallsicknesses
• gallstone
• gallstones
• gallumph
• gallumphed
• gallumphing
• gallumphs
• Gallup poll
• gallus
• galluses