13 letters
- handicrafters23
- haruspication23
- heartsickness23
- helicoptering25
- hematological25
- hematopoietic24
- hemicellulose25
- hemichordates24
- hemispherical27
- hermeneutical24
- heterocyclics27
- heterogametic23
- heteromorphic26
- heterothallic22
- heterotrophic23
- heuristically23
- hieroglyphics28
- histaminergic24
- histochemical27
- historicities18
- historicizing30
- homoeroticism24
- homoiothermic26
- homologically28
- homopolymeric30
- homoscedastic25
- honorifically26
- horticultural22
- horticultures21
- humifications26
- hydraulically27
- hydrocephalic30
- hydrodynamics28
- hydroelectric25
- hydromagnetic27
- hypercalcemic33
- hypercritical27
- hyperesthetic25
- hypereutectic27
- hyperglycemic34
- hypermetrical27
- hypermetropic29
- hyperphysical31
- hyperromantic27
- hypertonicity26
- hyperuricemia27
- hypoglycemics34
- ichthyofaunae27
- ichthyofaunal28
- ichthyofaunas27
- ichthyologies25
- ichthyologist25
- iconographers24
- iconographies24
- identicalness20
- ideogrammatic25
- ideologically24
- idiomatically24
- idiomaticness21
- idiosyncratic23
- illicitnesses19
- illogicalness22
- illusionistic20
- imagistically25
- immanentistic24
- immunogenetic27
- immunological28
- imperialistic23
- implicatively30
- impolitically27
- impracticable29
- impracticably31
- impractically29
- inarticulates19
- incommunicado29
- inconspicuous26
- inefficacious27
- inefficiently27
- infraspecific29
- injudiciously32
- inorganically24
- insignificant24
- insufficiency30
- intercortical21
- interdictions19
- interdistrict18
- interepidemic24
- intergalactic23
- intermetallic22
- interpandemic25
- interparticle21
- interspecific26
- intertropical21
- intoxicatedly28
- intoxications25
- intragalactic23
- intraspecific26
- intrathoracic22
- intricateness18
- intrinsically22
- iontophoretic22
- isoelectronic21
- isometrically23
- isosmotically23
- isostatically20
- isotonicities17
- italicization27
- jollification31
- judgmatically36
- judiciousness29
- jurisdictions28
- justification30
- justificative33
- justificatory31
- kaleidoscopic28
- kinematically28
- kinnikinnicks32
- knickerbocker35
- lackadaisical26
- lethargically25
- lexicographer31
- lexicographic34
- lexicologists27
- lichenologies23
- lichenologist23
- lickerishness24
- lignification24
- linguistician22
- lithification23
- logicalnesses21
- logogrammatic27
- ludicrousness21
- lymphatically31
- lymphoblastic31
- lymphographic34
- lyricalnesses21
- machicolation26
- macroeconomic29
- magistratical22
- magnetometric25
- magnetostatic22
- magnification26
- magnificences29
- magnificently29
- malacological27
- maliciousness22
- mariculturist22
- masticatories19
- materialistic20
- mathematician25
- matriculating24
- matriculation22
- medicamentous25
- megaloblastic26
- melodramatics24
- meningococcic32
- mesencephalic29
- metabolically27
- metachromatic27
- metafictional24
- metallurgical25
- metamerically26
- metaphysician27
- metencephalic29
- meteoriticist19
- microanalyses23
- microanalysis23
- microanalysts23
- microanalytic26
- microbalances27
- microbiologic28
- microbrewings28
- microcapsules27
- microcassette22
- microcephalic31
- microcircuits26
- microclimates26
- microclimatic29
- microcomputer29
- microcosmoses25
- microcrystals25
- microcultural26
- microcultures25
- microeconomic29
- microelements24
- microfilament27
- microfilariae23
- microfilarial24
- microfilmable30
- microfunguses27
- micrographics29
- micrographing29
- microhabitats24
- microinjected33
- micromanagers25
- micromanaging28
- micronutrient22
- microorganism25
- microparticle26
- microphyllous29