different between chastises vs chastiser

English

chastises

chastise +? -er

chastiser (plural chastisers)

Someone who chastises
- 1779 Samuel Johnson (ed) - The Works of the English Poets
  That kind chastiser of thy soul in joy!
- 2000 A.C. Bhaktivedanta Swami Prabhupada - Bhagavadgita As It Is
  Having spoken thus, Arjuna, chastiser of enemies, told Krsna, "Govinda, I shall not fight," and fell silent.

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