10 letters
- heliolatry16
- heliotrope16
- hematology20
- hemorrhage19
- hepatocyte20
- heptachlor21
- heraldries14
- hereditary15
- heresiarch17
- heretrices15
- heritrices15
- hermatypic23
- hermetical19
- hermitages17
- heroically19
- herstories12
- heterocyst17
- heterogamy19
- heterogony17
- heterophil18
- hexarchies24
- hierarchal18
- hieroglyph22
- hierophant18
- highflyers22
- histologic18
- historical16
- holidayers16
- hologamies18
- holographs20
- holography22
- hologynies18
- holophytic23
- holstering16
- homeopaths20
- homeopathy22
- homographs22
- honoraries13
- honorarily16
- horologies15
- horologist15
- horsehairs14
- horselaugh18
- horseplays18
- horsepower18
- horseraces15
- horseshoer14
- horsetails13
- hospitable19
- hospitably21
- hostelries13
- hydroceles19
- hydrologic21
- hydrosolic19
- hydrospace21
- hygrograph23
- hygrometer19
- hygrophyte23
- hypaethral20
- hyperacute21
- hyperalert18
- hyperbaric23
- hyperbolae21
- hyperbolas21
- hyperboles21
- hyperbolic24
- hyperemias20
- hypergolic23
- hyperopias20
- hyperplane22
- hyperploid22
- hyperpneas21
- hyperpneic24
- hypersonic21
- hyperspace23
- hypertonia18
- hypertonic21
- hyphenates20
- hypocenter21
- hypocorism23
- hypocotyls23
- hypocrites20
- hypomorphs25
- hypoplasia21
- hypoploids22
- hypostatic20
- hypotheses19
- hypothesis19
- hypotonias18
- hypsometer20
- hysteretic17
- hysterical18
- iceboaters16
- iconolatry17
- ideographs18
- ideography20
- imperators16
- imprecates19
- improperly22
- inchoately19
- intercrops17
- interlaces15
- interlayer14
- interloper15
- interlopes15
- interphase16
- interplays17
- interposer14
- interspace17
- ionosphere16
- irresolute12
- isochronal17
- isoplethic19
- isopropyls19
- isothermal16
- karyologic22
- kiloparsec21
- lachrymose21
- lagomorphs21
- larghettos15
- latecomers17
- leadership17
- leafhopper22
- leathering16
- lectionary17
- lectotypes19
- legateship18
- legislator14
- leprosaria14
- leptospire17
- lethargies15
- levorotary17
- liberators14
- lighteners16
- lighterage17
- lightfaces21
- lighthouse18
- lightproof21
- linecaster15
- lipotropic20
- literacies14
- literators11
- lithograph20
- lithophane19
- lithophyte20
- lithopones17
- locutories15
- logaoedics17
- logarithms18
- logographs20
- logogriphs20
- logorrheas15
- logorrheic18
- logotypies18
- lophophore21
- lymphatics24
- macrophyte23
- megasporic21
- meliorates14
- meliorator14
- mesophytic23
- mesothelia16
- metaphoric21
- metaphysic23
- metropolis17
- micrograph23
- microphage23
- micropores19
- micropylar22
- micropyles22
- microspore19
- mycologies21
- mycologist21
- mycophiles24
- myopathies20
- mythologer20
- mythologic23
- mythopoeia20
- mythopoeic23
- narcolepsy20
- necropoles18
- necropolis18
- neoplastic18
- neorealist12
- neotropics17
- nephoscope22
- nephrology21
- nephrotics19
- nightscope21
- notepapers17
- obligatory18
- ochlocrats19
- octarchies18
- octonaries14
- oecologies16
- oenophiles17
- oleographs18
- oligoclase17
- oligophagy22
- omophagies20