Synonyms for Whatchamacallit:

• adj.

  •anonymous (adjective)
  • pseudonymous,
  • pseudo,
  • Bearding,
  • undisclosed,
  • unnamed,
  • secret,
  • incognito.
  •nameless (adjective)
  • unheard-of,
  • unheard of,
  • undistinguished,
  • inconspicuous,
  • untitled,
  • uncelebrated,
  • unsung,
  • unfamed,
  • unnoted,
  • obscure.
  •Other relevant words: (adjective)
  • unacknowledged,
  • nameless,
  • Undesignated,
  • unattested,
  • unsigned,
  • unclaimed,
  • unspecified,
  • you know who,
  • Innominate,
  • so and so,
  • unavowed,
  • uncredited,
  • whatsis,
  • anonymous,
  • such and such,
  • unidentified.

• n.

  •
  • something,
  • X,
  • so-and-so.
  •apparatus (noun)
  • gimmick,
  • dingbat,
  • means,
  • gear,
  • machine,
  • paraphernalia,
  • job,
  • gimcrack,
  • thingamajig,
  • mechanism,
  • tools,
  • outfit,
  • tackle,
  • utensils,
  • habiliments,
  • idiot box,
  • furnishings,
  • black box,
  • implement,
  • appliance,
  • supplies,
  • setup,
  • machinery,
  • contraption.
  •device (noun)
  • equipment,
  • creation,
  • arrangement,
  • contrivance,
  • construction,
  • medium,
  • agent,
  • material,
  • makeshift,
  • article,
  • invention,
  • resource,
  • rube goldberg invention,
  • expedient,
  • resort,
  • accessory,
  • shift,
  • utensil.
  •doodad (noun)
  • thing.
  •foobar (noun)
  • thud,
  • bar.
  •gadget (noun)
  • concern,
  • business.
  •gizmo (noun)
  • instrument.
  •object (noun)
  • fact,
  • volume,
  • commodity,
  • body,
  • phenomenon,
  • reality,
  • matter,
  • substance,
  • mass,
  • bulk.
  •Other relevant words: (noun)
  • whatnot,
  • Fred,
  • WHOSIS,
  • grabber,
  • jigger,
  • whatnots,
  • stuff,
  • Waldo,
  • Baz,
  • accoutrement,
  • tool,
  • jobs,
  • thingamabob,
  • Accoutrements,
  • corge,
  • GISMOS,
  • provisions,
  • garply,
  • doodad,
  • gaffs,
  • plugh,
  • gadget,
  • FREDS,
  • grault,
  • wombat,
  • whatsit,
  • XS,
  • gizmo,
  • widget,
  • grabbers,
  • device,
  • rigging,
  • object,
  • gismo,
  • thingamabobs,
  • doohickey,
  • gaff,
  • apparatus,
  • xyzzy,
  • quux,
  • mechanical device,
  • FOO,
  • FOOBAR,
  • QUX,
  • wombats.
  •sundries (noun)
  • sundries.
  •sundry (noun)
  • sundry.
  •tool (noun)
  • weapon,
  • engine.

• Other synonyms:

  •
  • whatsername,
  • thingy,
  • doodah,
  • whatsisname.
  •Other relevant words (noun):
  • thingmajig,
  • thingumajig,
  • hickey,
  • twist,
  • whatchamacallum,
  • doojigger,
  • gubbins,
  • thingummy,
  • Rube Goldberg,
  • entity,
  • convenience,
  • Dingus,
  • thingumabob,
  • item,
  • thingmabob.

Antonyms for Whatchamacallit:

• adj.

  • anonymous
    known, named, identified.
  • nameless
    eminent, famous, designated, prominent, renowned, distinguished.

• n.

  • device
    disorganization, ruin, destruction.
  • object
    nothingness, subject, nothing.