16 letters
- pornographically34
- positivistically30
- postsynaptically32
- practicabilities29
- precancellations29
- precariousnesses24
- precertification29
- premodifications30
- prenotifications27
- prequalification37
- pretechnological32
- prognostications26
- programmatically34
- prophylactically37
- prosopographical33
- psychoanalytical34
- psychobiological36
- psychohistorical32
- psychometrically36
- psychopathically38
- psychophysically40
- quadruplications36
- quantificational35
- radiographically31
- recapitalization33
- recertifications26
- reclassification27
- refortifications26
- relativistically28
- requalifications34
- resolidification25
- roentgenological27
- saccharification31
- scandalmongering31
- scandalousnesses24
- sedimentological28
- semidomesticated27
- sesquicarbonates33
- stenographically31
- stereophonically29
- stereoscopically29
- stroboscopically32
- subvocalizations38
- supercalendering29
- surrealistically25
- syllabifications30
- syncategorematic30
- technicalization36
- teratocarcinomas26
- terminologically30
- thermometrically31
- thermostatically28
- thyrocalcitonins29
- trafficabilities29
- tyrannicalnesses25
- ultraparadoxical33
- unapologetically31
- undemocratically32
- undercapitalized36
- undiplomatically33
- ungrammaticality32
- unscientifically32
- unsophistication27
- unsystematically30
- whatchamacallits34