bulb vs bulbous

bulb is a noun but bulbous is not a noun.

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

bulb (noun)	bulbous (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 rounded part of a cylindrical instrument (usually at one end)
a rounded dilation or expansion in a canal or vessel or organ
lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
anything with a round shape resembling a teardrop

bulb (adjective)	bulbous (adjective)
	curving outward
	shaped like a bulb