determinative compound
Definition - (Aka tatpurusha)

A type of compound in which part of it gives information that pertains to the compound's head, but not by acting as a modifier.

For example, the word footstool denotes a stool that is for the feet, not a stool that is like a foot. Thus the word foot is not modifying the head stool, it is giving information that pertains to it.

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