Romps and rafts of otters

Wikipedia:

The word otter derives from the Old English word otor or oter. This and cognate words in other Indo-European languages ultimately stem from the PIE root *wódr̥ which also gave rise to the English word water.^[1][2]
An otter's den is called a holt or couch. A male otter is a dog, a female a bitch, and a baby a whelp, kit, or pup.^{[citation needed]} The collective nouns for otters are bevy, family, lodge or romp, being descriptive of their often playful nature, or when in water raft.

OED agrees and notes that otter was metanalyzed in the Middle Ages as "a notyr." (I seem to remember having blogged this fact but can't find the post.) A meaning of note:

c1700    Street-robberies Consider'd 33   Otter, a sailor.

Another:

A fishing device, typically used by poachers or other unlicensed anglers, consisting of a wooden float with baited hooks attached that is paid out on a long line; (also) a similar device used by anglers to retrieve fishing gear that has become snagged.