राजपुरुषःrājapuruṣaḥ
TatpuruṣaṢaṣṭhī, genitive relationthe king's man
राजrāja
king
पुरुषpuruṣa
man
Second member is the head
The first member stands in a genitive relationship to the second. The compound names a man, so puruṣa is the head.
Analytic paraphrase
rājñaḥ puruṣaḥ
In English
the king's man
