The best replacement for responder is respondent.

The best alternatives to responder are rated as following:
★★★★★  respondent
★★★  emt basic
★★★  professional rescuer
★★  contestar
★★  first aid
★★  emt
★  emr
★  file owner
★  first responder
★  reactor
★  transponder

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Google Trends

Scale is based on the average worldwide traffic of responder in all years. Click on graph for more.
responder
respondent
emt basic