13 letters
- inoffensively28
- inopportunely25
- inquisitively31
- inscriptively27
- insensitively22
- instinctively25
- instructively25
- intellections20
- intellectuals21
- intelligencer22
- intelligences22
- intelligently22
- intemperately23
- interactively24
- intercellular21
- interelectron19
- interpellated20
- interpellates19
- interpellator19
- interrelating18
- interrelation16
- intracellular21
- irrelevancies22
- irreligionist17
- irreligiously20
- isoelectronic21
- kapellmeister25
- lamellibranch28
- legislatively24
- leisureliness17
- mademoiselles22
- mantelshelves25
- marvelousness23
- melancholiacs27
- melanizations28
- melanogeneses21
- melanogenesis21
- mellifluently27
- mellifluously27
- melodiousness20
- melodramatics24
- melodramatise21
- melodramatist21
- melodramatize30
- meltabilities21
- mesotheliomas22
- microelements24
- miscellaneous23
- miscellanists22
- mischanneling27
- mischannelled26
- misdeveloping28
- multibarreled23
- multicellular25
- multichannels26
- myelencephala29
- myelofibroses25
- myelofibrosis25
- myelofibrotic28
- myoelectrical26
- nephelometers23
- nephelometric26
- nervelessness20
- nickeliferous26
- noncancelable27
- noncellulosic25
- nondeliberate20
- nondelinquent29
- nondeliveries21
- nonelectrical23
- nonelectronic23
- nonelementary22
- nonmyelinated23
- novelizations29
- obstructively27
- originatively23
- osteomyelitis19
- outdelivering23
- overbejeweled34
- overdeveloped27
- overelaborate21
- overembellish27
- overreliances22
- parallelogram24
- pelletization28
- penultimately25
- perspectively29
- philhellenism27
- philhellenist24
- photoelectric25
- photoelectron23
- pickerelweeds28
- picturesquely33
- piezoelectric32
- platyhelminth28
- poliomyelitis23
- porcelainized31
- porcelainizes30
- porcelainlike26
- porcellaneous23
- precancelling28
- precipitately25
- predeliveries22
- predicatively27
- predominately24
- preliminaries21
- preliminarily24
- preparatively26
- prepositively26
- preselections21
- presumptively30
- pretelevision22
- progressively25
- prohibitively28
- proselytising22
- proselytizers28
- proselytizing31
- prospectively29
- provocatively30
- pseudoalleles21
- pumpernickels32
- purposelessly24
- pyrheliometer24
- qualitatively31
- quarrelsomely30
- radioactively24
- radioelements19
- radiolabeling22
- radiolabelled21
- reaccelerated21
- reaccelerates20
- rebarbatively26
- rechannelling25
- redevelopment26
- reeligibility22
- reiteratively20
- relandscaping25
- relatednesses16
- relationships20
- relaxednesses23
- reliabilities18
- religiosities16
- religiousness18
- relinquishing30
- relubricating24
- relubrication22
- remorselessly20
- restrictively23
- retributively24
- retroactively23
- salmonelloses20
- salmonellosis20
- schoolfellows27
- selectionists18
- selectiveness22
- selectivities21
- selenocentric22
- selenological22
- selenologists18
- selfishnesses20
- semiporcelain24
- semireligious20
- senselessness16
- shamelessness20
- shapelessness20
- shapelinesses20
- shellcrackers27
- siphonosteles20
- skeletonising22
- skeletonizers28
- skeletonizing31
- speculatively28
- speleological24
- speleologists20
- spiegeleisens20
- spinelessness19
- statelessness15
- statelinesses15
- storytellings20
- structureless19
- stylelessness18
- subordinately22
- subsatellites19
- substanceless22
- substantively25
- superelevated23
- superelevates22
- superlatively25
- syringomyelia24
- syringomyelic27
- tastelessness15
- telecommuters24
- telecommuting27
- telefacsimile24
- telegrapheses21
- telegraphists21
- telemarketers21
- telemarketing24
- telencephalic27
- telencephalon25