Is “Lightbulb” a Scrabble word?
Yes
LIGHTBULB
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Lightbulb
noun
1.An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.
2.(by extension) An article that resembles such a bulb and converts electricity to light by any process.
“a fluorescent light bulb”
3.Used in reference to the sudden arrival of a realization, an inspiration, an idea, or the like.
“a light bulb moment”
Synonyms: bulb, glow-lamp, incandescent lamp, light globe