Is stabilized dyed buckeye burl a wood or wood byproduct?

It is a wood.
It is tissue grown by the tree in response to some kind of stress or infection (often by a fungus).
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Logitech QuickCam Pro 9000 Spector NS5XL Buckeye Burl Top by Keng Bassist

ArtisanStreet’s Dyed Buckeye Wood Burl Hand Turned Bottle Stopper $38.50 Natural Buckeye Burl was dyed a brilliant green then hand turned to reveal the intricate sworls, knots, and eyes within. Mounted on a durable stainless steel base, this stopper is perfect to preserve wines, oils, or vinegar in style. MADE IN AMERICA…

Buckeye Burl Pen Blank, Natural Create a handsome, natural pen with beautiful figured burl. These blanks are stabilized with resin to ensure smooth turning and can be polished to a gleaming finish. Each blank is sold individually….

Buckeye Burl Pen Blank, Emerald Green $7.99 Buckeye Burl is one of the most unusual burls with its wild grain, eyes, and colors that range from bright yellow to cream with streaks of blue, black and white throughout. The dye process provides you with a consistent color throughout the blank. Blank size is 7/8″ x 7/8″ x 5-1/8″….

Buckeye Burl Pen Blank, Ocean Blue $7.99 Buckeye Burl is one of the most unusual burls with its wild grain, eyes, and colors that range from bright yellow to cream with streaks of blue, black and white throughout. The dye process provides you with a consistent color throughout the blank. Blank size is 7/8″ x 7/8″ x 5-1/8″….