The best replacement for request is requests.

The best alternatives to request are rated as following:
★★★★★  requests
★★★★  demand
★★★★  post
★★★  require
★★★  ask
★★★  session
★★  request for
★★  inquiry
★★  response
★★  get
★  request.querystring
★  command
★  query
★  post php
★  requisition
★  incident
★  order letter
★  question
★  request.form
★  petition
★  as per your request
★  upon request
  super agent
  change request
  purchase order
  enquiry
  page request
  appointment
  change order
  session scope
  on request
  inquiry letter
  number of page request
  incidents

Your alternative for request is not listed? Suggest!
Speaking about request, one probably shouldn't forget about message.

Other search terms related to request and their ratings are:
★★★★★ message
★★★★ github
★★★★ response
★★★ my request
You have in mind a companion for request and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of request in all years. Click on graph for more.
request
requests
demand