Mammoth Uncensored Word List:
41 words ending with ph, 11 letters long

allelomorph brontograph cardiograph chalcograph choreograph chronograph chrysograph coronagraph coronograph crescograph cryptograph dendroglyph dynamograph ergatomorph gastrograph glyphograph glyptograph helicograph heterotroph homoeomorph kinetograph nucleomorph odontograph organotroph palaeograph phlebograph pluviograph pneumograph polarograph pseudograph pseudomorph psychograph scintigraph seismograph selenograph shadowgraph stereograph stevengraph theriomorph thermograph torsiograph