13 letters
- innocuousness21
- insectivorous22
- insidiousness17
- instantaneous17
- insusceptible25
- insusceptibly27
- interdiffused23
- interdiffuses22
- interindustry19
- interstimulus20
- intramuscular23
- intravenouses20
- intravenously23
- intrusiveness20
- intussuscepts22
- invidiousness21
- irreligiously20
- isochronously23
- jealousnesses25
- judiciousness29
- justification30
- justificative33
- justificatory31
- laboriousness19
- lactobacillus26
- lecherousness21
- lepidopterous22
- leptocephalus27
- litigiousness18
- ludicrousness21
- lustfulnesses21
- luxuriousness25
- magnanimously27
- magnetopauses23
- maladjustment32
- maliciousness22
- malocclusions26
- marvelousness23
- medicamentous25
- meetinghouses22
- mellifluously27
- melodiousness20
- meningococcus30
- meritoriously20
- metalliferous22
- microfunguses27
- microphyllous29
- miscellaneous23
- mischievously29
- mistrustfully25
- molluscicidal27
- molluscicides26
- momentousness22
- monstrousness19
- mountainously23
- mousetrapping26
- mucocutaneous26
- multitudinous22
- murderousness20
- muscularities22
- musicianships26
- musicological27
- musicologists23
- mycetophagous29
- necessitously21
- nervousnesses20
- neuromuscular24
- nickeliferous26
- nonautonomous21
- nonconclusion25
- noncontagious22
- noncontiguous23
- noncontinuous22
- nondiapausing23
- nondiffusible27
- nongregarious20
- nonhomologous24
- noninclusions22
- nonindigenous21
- nonindustrial19
- noninfectious23
- nonleguminous24
- nonmonogamous25
- nonnutritious18
- noxiousnesses23
- obliviousness23
- obnoxiousness26
- obtrusiveness22
- obviousnesses22
- odoriferously21
- odorousnesses16
- officiousness24
- ominousnesses19
- onerousnesses16
- opprobriously26
- overambitious24
- overconscious25
- overcredulous24
- overfocussing27
- overingenious22
- overseriously21
- overzealously31
- ovoviviparous29
- packinghouses29
- papillomatous25
- papovaviruses28
- paramyxovirus33
- pendulousness22
- penuriousness20
- percussionist21
- perfusionists21
- perspicacious26
- perspicuously27
- pestiferously23
- phycomycetous32
- piteousnesses18
- platitudinous21
- plausibleness23
- plenitudinous22
- plenteousness20
- polychotomous28
- polyphonously29
- pompousnesses24
- ponderousness20
- porcellaneous23
- postholocaust23
- precalculuses26
- precipitously26
- precombustion27
- preindustrial20
- premenopausal25
- prestigiously22
- pretentiously21
- profusenesses21
- prolegomenous24
- promiscuously27
- proteinaceous21
- prussianising21
- prussianizing30
- punctiliously26
- pushfulnesses25
- pusillanimity25
- pusillanimous24
- querulousness27
- rabbitbrushes25
- rapaciousness21
- rapturousness19
- raucousnesses19
- readjustments28
- reclusiveness23
- rectitudinous20
- religiousness18
- rendezvousing32
- repercussions21
- repetitiously20
- resuscitating20
- resuscitation18
- resuscitative21
- resuscitators17
- reusabilities18
- rhabdoviruses24
- righteousness19
- riotousnesses15
- ruinousnesses17
- rumbustiously25
- sagaciousness20
- salaciousness19
- sanctimonious22
- sarcophaguses24
- schussboomers25
- scrumptiously27
- seclusiveness23
- seditiousness16
- semiconscious24
- semireligious20
- sententiously19
- serendipitous19
- seriousnesses15
- serpiginously23
- sinuousnesses17
- splendiferous23
- spontaneously22
- staggerbushes23
- steeplebushes23
- stegosauruses17
- stercoraceous20
- stoloniferous19
- stratocumulus23
- strenuousness17
- streptococcus26
- subbituminous26
- subcoriaceous24
- subindustries20
- subreptitious21
- subterraneous19
- sulfurousness21
- sumptuousness23
- supercautious22
- superclusters22
- superfluously26