12 letters
- guaranteeing19
- guesstimated19
- guesstimates18
- guttersnipes19
- hairsplitter18
- hallucinated22
- hallucinates21
- halterbreaks22
- halterbroken23
- handicrafter22
- harbormaster20
- headquarters25
- hearteningly21
- heavyhearted23
- heldentenors18
- helicoptered22
- hellgrammite24
- hemichordate23
- hemihydrated23
- hemihydrates22
- hemoproteins21
- heteroauxins23
- heterocercal21
- heteroclites18
- heterocycles23
- heterocyclic26
- heterodoxies22
- heteroduplex27
- heterodyning21
- heteroecious18
- heteroecisms20
- heterogamete19
- heterogamety21
- heterogamies19
- heterogamous20
- heterogenies17
- heterogenous18
- heterogonies17
- heterografts19
- heterokaryon21
- heterologous18
- heteronomies18
- heteronomous19
- heterophylly25
- heteroploids19
- heteroploidy21
- heterosexual23
- heterotrophs19
- heterotrophy21
- heterozygote27
- heterozygous28
- hexahydrates26
- highlighters23
- hindquarters26
- homesteaders18
- homesteading21
- hootenannies17
- houseboaters18
- housemasters18
- housepainter19
- hucksterisms25
- hydrogenated21
- hydrogenates20
- hydrolysates20
- hydrolyzates29
- hydrometeors20
- hydroxylated28
- hydroxylates27
- hymenopteran24
- hymenopteron24
- hyperexcited30
- hyperextends28
- hyperintense21
- hypertension21
- hypertensive24
- hypochlorite25
- hypotensions21
- hypotensives24
- hypothecated25
- hypothecates24
- hysterectomy24
- hysterically23
- illegitimate19
- illiteracies17
- illiterately17
- immaculately26
- immoderately22
- impenitences23
- impenitently23
- impersonated20
- impersonates19
- implementers23
- impoliteness20
- inaccurately23
- inadequately27
- inadvertence22
- inadvertency24
- inappetences23
- inappositely22
- inarticulate18
- inattentions15
- incapacitate22
- incarcerated20
- incarcerates19
- inchoateness19
- inclinometer21
- incompetence26
- incompetency28
- incompetents23
- incompletely26
- inconsistent18
- incorporated20
- incorporates19
- incriminated21
- incriminates20
- indebtedness19
- indefinitely21
- indelicately21
- individuated21
- individuates20
- indoctrinate18
- inexistences24
- infiniteness18
- ingurgitated19
- ingurgitates18
- innatenesses15
- inoperculate21
- inordinately18
- insistencies17
- inspectorate19
- instantiated15
- instantiates14
- instrumented19
- integrations16
- intellection19
- intellective22
- intellectual20
- intelligence21
- intelligible21
- intelligibly23
- intemperance23
- intenerating17
- inteneration15
- intensifiers17
- intensifying22
- intentnesses15
- interactants17
- interactions17
- interallelic19
- interbedding21
- interborough21
- intercalated18
- intercalates17
- intercepters19
- intercepting22
- interception20
- interceptors19
- intercession17
- intercessors16
- intercessory18
- interchained20
- interchanged22
- interchanger21
- interchanges21
- interchannel21
- intercluster18
- intercoastal17
- intercompany25
- intercompare22
- interconnect21
- interconvert21
- intercoolers17
- intercostals17
- intercountry20
- intercourses17
- intercropped23
- intercrossed17
- intercrosses16
- interculture19
- intercurrent18
- intercutting20
- interdealers15
- interdepends19
- interdicting20
- interdiction18
- interdictive21
- interdictors17
- interdictory19
- interdiffuse21
- interestedly17
- interfacings22
- interfaculty23
- interference20
- interfertile17
- interfluvial23
- interfolding21
- interfusions18
- intergeneric19
- interglacial20
- intergrading19