16 letters
- refrangibilities26
- regardlessnesses21
- regeneratenesses20
- regionalizations30
- regressivenesses23
- reincorporations24
- reindustrialized30
- reindustrializes29
- reinterpretation21
- reinvestigations24
- relativistically28
- relentlessnesses20
- remarkablenesses28
- remilitarization30
- remorsefulnesses25
- remunerativeness26
- renormalizations31
- reorchestrations22
- reorganizational30
- repetitivenesses24
- reprehensibility28
- representational22
- representatively27
- representativity26
- repressibilities23
- repressivenesses24
- reprivatizations33
- requalifications34
- resistlessnesses18
- resocializations30
- resolidification25
- respectabilities26
- respectfulnesses28
- respectivenesses27
- respiritualizing33
- responsibilities24
- responsivenesses25
- resurrectionists21
- retinoblastomata24
- retransformation24
- retrievabilities24
- retroreflections24
- revengefulnesses29
- revisualizations32
- schoolmistresses25
- sclerenchymatous32
- stereoisomerisms22
- stereomicroscope28
- stereophonically29
- stereoregularity22
- stereoscopically29
- stresslessnesses18
- stretchabilities25
- superbillionaire26
- superbureaucrats28
- superenciphering32
- supermillionaire26
- surefootednesses22
- surrealistically25
- syncategorematic30
- technostructures27
- teleconferencing31
- thermoregulating28
- thermoregulation26
- thermoregulators25
- thermoregulatory27
- thermoremanences29
- threadbarenesses23
- transparentizing33
- tremendousnesses23
- ultraprogressive27
- ultrarespectable28
- underappreciated29
- underemphasizing39
- underemployments32
- underestimations23
- underrepresented24
- undersecretaries22
- undifferentiated27
- unidirectionally27
- unpredictability31
- unpreparednesses26
- unreasonableness24
- unrepresentative26
- unreservednesses24
- unresponsiveness27
- unrestrainedness21
- videoconferences32