棘

// Botanical: The jujube tree (//Ziziphus jujuba*) or more broadly any thorny plant, bramble, or prickle.

• Environmental: Thickets or overgrowth; in contexts involving roads or gardens, may signify neglect or abandonment.
• Punitive: Technical term for specific forms of torture or execution involving thorns (e.g., 棘刑).
• Metaphorical: Obstacles, difficulties, irritation, political friction, or personal hardship.

• Primarily functions as a noun.
• Can function attributively/adjectivally to mean “prickly,” “difficult,” or “painful.”

• Distinguish between the specific botanical identity of the jujube and the general property of prickliness.

In most classical contexts, the "thorn" aspect—whether literal, punitive, or metaphorical—is the primary driver of meaning.