11 letters
- heterokarya19
- heterophile19
- heterophony21
- heterospory18
- heterotroph18
- hexagonally27
- holographed22
- holographer21
- holographic24
- honeyeaters16
- horseplayer19
- hydrogenate19
- hymenoptera22
- hyperborean22
- hypercapnia25
- hypercapnic28
- hypercharge25
- hyperphagia25
- hyperphagic28
- hyperplanes23
- hypersthene21
- hypertrophy25
- hypocenters22
- hypocentral23
- hypothecate23
- hypothermal24
- iconography24
- incarcerate18
- incorporate18
- incorporeal19
- incorrectly21
- intercalary18
- intercooler16
- lachrymator22
- laparoscope21
- laparoscopy23
- leatherleaf18
- leatherneck22
- lichenology23
- lithography23
- lycanthrope23
- lycanthropy25
- melanophore21
- naphthalene21
- narcoleptic22
- narratology17
- neocortical19
- nephrectomy25
- nephropathy24
- octagonally21
- oligochaete19
- opalescence22
- openhearted18
- operational16
- opportunely22
- organically21
- orthocenter17
- orthography22
- orthopteran17
- overoperate18
- paleobotany21
- paleography24
- palynologic24
- pamphleteer23
- panegyrical23
- pantographs22
- pantropical22
- paperhanger22
- paragenetic20
- paratrooper17
- parenchymal26
- parochially23
- pearlescent19
- penological22
- pentahedral19
- percentages20
- perchlorate20
- percolating21
- percolation19
- percolators18
- peregrinate17
- perinatally19
- perpetually22
- petrodollar17
- petroglyphs24
- petrography23
- phagocytose23
- phalanstery20
- phonographs24
- phonography26
- photographs23
- photography25
- photosphere21
- phraseology21
- phylloxerae27
- phytochrome26
- pictography26
- pigeonholer20
- placatingly24
- placeholder22
- planetology21
- planography25
- plantocracy24
- platyrrhine20
- plecopteran22
- pococurante22
- poltroonery18
- polycentric24
- polychaetes22
- polygenetic23
- polygrapher24
- polygraphic27
- polynuclear23
- polyphenols24
- polytechnic26
- polyvalence26
- pomegranate20
- pornography24
- postcollege21
- practically24
- praelecting21
- preachingly25
- precanceled23
- preclearing21
- precolleges21
- precolonial20
- preconcerts21
- predoctoral19
- preelecting21
- preelection19
- preelectric21
- preemergent20
- preerecting20
- preheadache22
- preparation18
- preparatory19
- prepotently21
- preschooler20
- prevalently23
- procaryotes19
- procephalic26
- procreating20
- procreation18
- profanatory20
- prolegomena21
- proletarian16
- propagation20
- propagators19
- propellants20
- propellents20
- prophetical23
- propranolol20
- protectoral18
- prothoraces19
- prothoracic22
- protogalaxy26
- protoplanet19
- psychograph28
- purpleheart21
- pyrotechnic25
- reaccepting23
- reactionary17
- reallocated17
- reallocates16
- reappearing20
- reapportion18
- recalculate20
- recarpeting20
- receptacles21
- rechallenge21
- reciprocate20
- recollected20
- rectangular19
- reflectance22
- regenerable18
- regenerated15
- regenerates14
- regenerator14
- relocatable19
- renographic22
- reoperating17
- reoperation15
- repellently20
- replaceable22
- replacement22
- reproaching22
- reprography23
- rerepeating17
- rheological20
- scenography24
- shortchange21
- sonographer19
- stenography21
- stereograph18
- stereophony19
- straphanger19
- technically24
- technocracy25
- technologic23
- technophile23