bulb vs filament

bulb and filament both are nouns.

Word	Noun	Adjective	Verb	Adverb
bulb	Yes	No	No	No
filament	Yes	No	No	No

bulb (noun)	filament (noun)
electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity	a thin wire (usually tungsten) that is heated white hot by the passage of an electric current
a rounded part of a cylindrical instrument (usually at one end)	a threadlike structure (as a chainlike series of cells)
a rounded dilation or expansion in a canal or vessel or organ	the stalk of a stamen
lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)	a very slender natural or synthetic fiber
a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
anything with a round shape resembling a teardrop