15 letters
- interrogatively25
- interrogatories18
- interscholastic25
- interstratified20
- interstratifies19
- intersubjective36
- intertextuality27
- intertwinements24
- interuniversity24
- intervalometers24
- interventionism25
- interventionist22
- intervisibility26
- intervisitation21
- intolerableness22
- intracellularly26
- intracerebrally26
- intramuscularly28
- intransigeances23
- intransigeantly23
- intraperitoneal21
- intrapopulation25
- intrapreneurial22
- intravascularly28
- intricatenesses20
- introspectional24
- introspectively29
- intrusivenesses22
- intuitivenesses22
- intussuscepting27
- intussusception25
- intussusceptive28
- invariabilities24
- invectivenesses28
- inventivenesses26
- investigational24
- invidiousnesses23
- invincibilities28
- inviolabilities25
- inviolatenesses22
- invisiblenesses25
- involuntariness24
- invulnerability29
- keratinizations30
- kindergarteners24
- kindheartedness25
- kinesthetically29
- kremlinologists27
- labyrinthodonts26
- latitudinarians20
- leisurelinesses19
- machinabilities28
- maintainability26
- maladministered25
- marginalization32
- masculinization34
- meaninglessness24
- melodramatising26
- melodramatizing35
- mercaptopurines29
- mercenarinesses23
- metalinguistics26
- methamphetamine32
- methylxanthines34
- microinjections35
- micropublishing34
- mineralizations30
- mineralogically29
- miniaturization30
- misapprehending31
- misarticulating26
- misinformations26
- misinterpreting25
- misrepresenting25
- mistranscribing28
- momentarinesses23
- monocrystalline27
- monumentalizing37
- mountaineerings24
- mountainousness23
- mouthwateringly30
- multidiscipline29
- multilingualism29
- multiprocessing29
- multitudinously27
- nephrectomizing39
- niggardlinesses23
- nincompooperies29
- nitroglycerines25
- noncarcinogenic30
- noncoincidences29
- nonengineerings24
- nonindependence28
- noninflammatory30
- noninflationary25
- noninflectional27
- noninformations25
- noninsecticidal26
- noninstrumental24
- nonintellectual25
- nonintercourses22
- noninterference25
- nonintersecting24
- nonintervention24
- nonintimidating25
- nonintoxicating31
- noninvolvements31
- nonoverlappings31
- nonrecombinants28
- norepinephrines26
- notwithstanding26
- obstinatenesses20
- obtainabilities23
- occidentalizing36
- opinionatedness22
- organochlorines25
- orthogonalizing33
- outmanipulating28
- overabstracting28
- overadvertising27
- overclassifying31
- overcompressing31
- overcontrolling28
- overdiscounting28
- overdocumenting31
- overdramatizing35
- overelaborating26
- overemphasizing39
- overencouraging29
- overengineering26
- overentertained22
- overfertilizing35
- overglamorizing37
- overidentifying29
- overimaginative29
- overindulgences29
- overingenuities24
- overintensities21
- overinvestments28
- overlengthening29
- overopinionated25
- overornamenting27
- overprescribing31
- overprogramming33
- overrefinements27
- oversimplifying34
- overspeculating30
- overstimulating27
- oversubscribing32
- overwithholding31
- oxytetracycline34
- painterlinesses21
- paralinguistics26
- pararosanilines21
- particularising26
- particularizing35
- pectinesterases22
- perfunctoriness27
- persnicketiness27
- pharmacokinetic34
- phenolphthalein31
- phosphocreatine29
- phosphoproteins29
- phosphorylating31
- photoengravings30
- photofinishings29
- photoinductions27
- phrasemongering29
- phthalocyanines30
- pinealectomized36
- pinealectomizes35
- pinheadednesses24
- pinocytotically31
- plainclothesman30
- plainclothesmen30
- plainspokenness29
- plaintivenesses25
- platinocyanides27
- platitudinarian23
- platitudinizing34
- platitudinously26
- platyhelminthic33
- pointlessnesses21
- polycrystalline29
- postinoculation25
- postpollination25
- postvaccination30
- precipitinogens28
- preconditioning27
- predestinarians21
- predestinations21
- preestablishing27
- preinterviewing29
- prekindergarten27
- preterminations23
- procrastinating25
- procrastination23
- procrastinators22
- prognosticating27
- proportionating25