nominator
noun[C]
uk/ˈnɒmɪneɪtər/ussomeone whoofficiallysuggeststhat apersonshould beconsideredto do aparticularjob, takepartin anelection,receiveanhonour, etc.:
Theformhasspacesfor the candidate'snameandaddress, and for the nominator's and seconder'ssignatures.