The Italian term "pianura, piano, modesto" matches the English term "plain"

other italian words that include "pianura" : english :
pianura, livello, appianare, gradino, posizione level
gradino, pianura, rango rank
other italian words that include "piano" : english :
tastiera, pianola keyboard
bassopiano lowlands
altipiano pateau
pianoforte piano
altipiano plateau