We have words for when we have no words.

Thanks to David Crystal for the original list.

deeleebob

deeleebobber

diddleebob

diddleydo

diddleything

dingus

dingdong

dingy

dooda

doodad

doohickey

gadget

geega

gewgaw

gimmick

gizmo

goodie

hootenany

lookit

oojamaflop

thingamabob

thingamabobbit

thingamajig

thingummy

thingummybob

thingy

thingybob

whatchacallum

whatchacallit

whatchamacallit

whatever

whatsitsname

whatsit

whatnot

widget

 

David Crystal must be one of the most accessible and amiable contemporary linguists that I know.  He bridges erudition and humour. Read his books.

https://www.davidcrystal.com/GBR/David-Crystal