Synonyms of whatchamacallit

1 Syllable

tools, baz, foo, fred, grault, plugh, quux, qux, tool, x

2 Syllables

jiggers, gismo, doodad, waldo, widget, whatsit, wombat, object, gizmo, corge, garply, xyzzy, foobar, gadget, unsung, whatsis, whosis, jigger

3 Syllables

doohickey, unnamed, untitled, nameless, objecting, obscure, unclaimed, unnoted, device, unheard-of, unfamed

4 Syllables

anonymous, apparatus, unavowed, inconspicuous, incognito, unattested, pseudonymous, uncredited

5 Syllables

undistinguished, innominate, unacknowledged, undesignated, uncelebrated