Noun informant has 2 senses
  1. informant, source - a person who supplies information
    --1 is a kind of communicator
    --1 has particulars:
     informer, betrayer, rat, squealer, blabber; leaker; passive source; whistle blower, whistle-blower, whistleblower
    Derived form: verb inform1
  2. witness, witnesser, informant - someone who sees an event and reports what happened
    --2 is a kind of perceiver, observer, beholder; speaker, talker, utterer, verbalizer, verbaliser
    --2 has particulars: attester, attestant; testifier, deponent
    Derived form: verb inform1