Firebug is a 7 letter English word. It's valid Scrabble word worth 13 points. It's valid Words with friends word worth 16 points.
You can make 122 anagrams from letters in firebug (befgiru).
An Americanism dating back to 1870-75; fire + bug1
This woman might indeed be the “firebug” whom she and Jane had considered as a possibility.
As he flashed by, the firebug raised his head and shook his fist at the plane.
I saw one of them enter the old barn and wondered if the firebug was armed.
And in all these fires the firebug had neither been seen nor traced.
Johnny told of his new task and of his hopes of capturing the firebug.
The car was still there, but there was no sign of the firebug.
One more thing; if the fire had been set, was the firebug still about the place?
That firebug has burned school houses, a recreation center, the zoo.
You know they're after the firebug, an' you better watch out!
They have been looking everywhere for the firebug, and offer a fifty-dollar reward.