Polygraph rhymes with:
allograph, autograph, choreograph, echograph, hectograph, intergraph, lithograph, mimeograph, monograph, paragraph, pendergraph, phonograph, photograph, reprograph, spectrograph, telegraph
allograph, autograph, choreograph, echograph, hectograph, intergraph, lithograph, mimeograph, monograph, paragraph, pendergraph, phonograph, photograph, reprograph, spectrograph, telegraph