This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. a plant of the genus Pyracantha; the pyracanthus

n. any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries

"Pyracantha, aka firethorn, makes a great cat-proof hedge en-masse, but as an individual it can look stunning at this time of year and does so there."

shrub    bush