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[-[[caption-width-right:300: Because "South American Cavy Rodent" just doesn't have the same ring to it.]]-]

->''"I was just thinkin'. About goldfish. Even though they are called 'goldfish' they aren't gold-colored, are they? They are red, right? The 'blue light' on traffic lights too, aren't they green? Things like that make me sick..."''
-->-- '''Yuno''', ''Manga/HidamariSketch''

Have you ever noticed how sometimes, pickles are ''really'' salty?

That's the sort of thing this article would be about if it were a SelfDemonstratingArticle. But it isn't. [[AndThatsTerrible That would be silly.]]

A birthday cake is a cake you eat on your birthday. That makes sense. But a butterfly is not a fly, a peanut is not a nut, and a ten-gallon hat can't even hold one gallon of liquid. Words or combinations of words like this whose meaning has nothing to do with their name are known as ''misnomers''.

Mostly for historical reasons the misnomer sticks and nobody--or almost nobody--bats an eyelid when it is used, since it is well accepted and people know what it means; this particular variant is a common result of [[CallASmeerpARabbit calling Smeerps "rabbits"]]. A {{Cloudcuckoolander}} character and punster tropers are likely to [[LampshadeHanging hang a lampshade]] on these from time to time, complain that [[ExactlyWhatItSaysOnTheTin contents of the tin differ from the label]] (or that the tin itself is not made of tin), and that [[MadeFromRealGirlScouts there's no baby in baby food]].

When the name once fit but no longer does, see ArtifactTitle. If the name is itself an element of ''deliberate deception'', it may be {{Doublespeak}} or a SuperFunHappyThingOfDoom.

For ''series'' with nonindicative names, see WordSaladTitle and NeverTrustATitle. For songs, see NonAppearingTitle. FluffyTheTerrible, DeathbringerTheAdorable, IronicName, and IronicNickname are subtropes of this.

Contrary to ExactlyWhatItSaysOnTheTin. See InNameOnly when this trope applies to the title of a derivative work.

While explanations for misnomers are welcome and encouraged, please resist the urge to make a Administrivia/JustifyingEdit.

Looking to have fun with misleading names? See JustForFun/IThoughtItMeant, for misleading trope names, and JustForFun/IThoughtThatWas, for misleading work names.

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[[folder:Audio Plays]]
* ''AudioPlay/BigFinishDoctorWho'': In "[[Recap/BigFinishDoctorWho043DoctorWhoAndThePirates DoctorWho and the Pirates]]", the brutal first mate - TheDragon to the BigBad Red Jasper - has the innocuous and jolly sounding name of Merryweather.

[[folder:Newspaper Comics]]
* ''ComicStrip/{{Garfield}}'': [[http://garfield.com/comic/2014-02-08 "Aphrodite"]] isn't a name that fits a mule that "had three legs, a glass eye, and one tooth".