Name for words like whatchamacallit, doohickey, thingamabob



Is there a name for words like whatchamacallit, doohickey, thingamabob, doodad, thingamajig, whatsit, etc.?


Somehow it seems like there should be a word to describe the general term for a word that you use for referring to something when you cannot remember what it is called.


(Computing names like foo, bar, baz are examples of metasyntactic variables but those are a slightly different category.)




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