light bulb(n = noun.artifact) bulb, electric light, electric-light bulb, incandescent lamp, lightbulb - electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity;
is a kind of electric lamp
has parts: filament

   A glass bulb with metallic contacts on the outside connected to a wire filament (usually tungsten) inside that emits light when heated by passage of electricity through the filament; -- used as the replaceable light-emitting component of an electric lamp, flashlight, lighting fixture, etc. [WordNet 1.5]

N  luminary, light, flame, spark, scintilla, phosphorescence, fluorescence, sun, orb of day, Phoebus, Apollo, Aurora, star, orb, meteor, falling star, shooting star, blazing star, dog star, Sirius, canicula, Aldebaran, constellation, galaxy, zodiacal light, anthelion, day star, morning star, Lucifer, mock sun, parhelion, phosphor, phosphorus, sun dog, Venus, aurora, polar lights, northern lights, aurora borealis, southern lights, aurora australis, lightning, chain lightning, fork lightning, sheet lightning, summer lightning, ball lightning, kugelblitz, phosphorus, yellow phosphorus, scintillator, phosphor, firefly luminescence, ignis fatuus, Jack o'lantern, Friar's lantern, will-o'-the- wisp, firedrake, Fata Morgana, Saint Elmo's fire, glowworm, firefly, June bug, lightning bug, anglerfish, gas, gas light, lime light, lantern, lanthorn, dark lantern, bull's-eye, candle, bougie, taper, rushlight, oil, wick, burner, Argand, moderator, duplex, torch, flambeau, link, brand, gaselier, chandelier, electrolier, candelabrum, candelabra, girandole, sconce, luster, candlestick, lamp, light, incandescent lamp, tungsten bulb, light bulb, flashlight, torch, arc light, laser, maser neon bulb, neon sign, fluorescent lamp, filament, socket, contacts, filler gas, firework, fizgig, pyrotechnics, rocket, lighthouse, self-luminous, glowing, phosphoric, phosphorescent, fluorescent, incandescent, luminescent, chemiluminescent, radiant, blossomed the lovely stars, the forget-me-nots of the angels, the sentinel stars set their watch in the sky, the planets in their station list'ning stood, the Scriptures of the skies, that orbed continent, the fire that severs day from night.

anchor light, arc light, artery of the penis bulb, artery of the vestibule bulb, auld light, beacon light, beam of light, bengal light, brake light, bring to light, bude light, bulb, calcium light, city of light, coherent light, come to light, conjunctival layer of bulb, corpuscular theory of light, electric light, electric-light bulb, electrical light, fairy light, finsen light, first light, flash bulb, green light, guiding light, hot bulb, idiot light, infrared light, inner light, klieg light, laser light, leading light, light, light adaptation, light air, light arm, light ballast, light beam, light beer, light bread, light breeze, light brown, light circuit, light colonel, light company, light cream, light diet, light filter, light flyweight, light footed, light heavyweight, light hour, light intensity, light into, light machine gun, light meter, light microscope, light middleweight, light minute, light opera, light out, light pen, light reaction, light reflex, light second, light show, light source, light speed, light time, light touch, light unit, light up, light upon, light welterweight, light whipping cream, light within, light year, lime light, make light of, navigation light, olfactory bulb, one-way light time, oxyhydrogen light, panel light, pilot light, ray of light, rear light, red light, red light district, riding light, room light, round-trip light time, running light, saint elmo's light, saint ulmo's light, see the light, shaft of light, shed light on, signal light, speed of light, stop light, strobe light, sweetness and light, theater light, traffic light, trip the light fantastic, trip the light fantastic toe, ultraviolet light, very light, vigil light, visible light, warning light, wave theory of light, wax light, yellow light, zircon light, zodiacal light