RichThesaurus
doohinkey
vs
thingamajig
doohinkey
noun
An unspecified or nameless thing; doohickey.
thingamajig
noun
Something that one does not know the name of.
How often have the words
doohinkey
and
thingamajig
occurred in a corpus of books?
(source:
Google Ngram Viewer
)