Anything that can be built from diatonic harmonisation of the mode, which is the same as the diatonic harmonisation of every other mode. Let me ask this. If the chord is tonic major but beat 1 of bar 2 of the (anacrusic) melody is mediant, is the melody Major or Phrygian? Leaving of Liverpool...
I think if you plan to try to "help" someone whom you already know really doesn't know the lingo, that it's ok to simplify it. We all know you're smart... Ain't gotta try to prove it all the time.
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