14 letters
- recoverability27
- rediscountable24
- reencountering23
- reincorporated22
- reincorporates21
- scornfulnesses24
- semicommercial30
- semiconducting29
- semiconductors26
- seriocomically27
- seroconversion23
- shuttlecocking31
- spectroscopies26
- spectroscopist26
- spinthariscope26
- staphylococcal32
- staphylococcic34
- staphylococcus32
- subcollections27
- subcommissions28
- subcommunities29
- subconsciouses26
- subconsciously29
- subcontinental25
- subcontracting28
- subcontractors25
- submicroscopic33
- supercolliders24
- supercomputers28
- superconducted28
- superconductor27
- superconfident27
- supercontinent24
- sycophantishly30
- tachistoscopes25
- tachistoscopic28
- teleconference26
- telescopically28
- thyrotoxicoses28
- thyrotoxicosis28
- tropocollagens25
- ultracompetent26
- unaccommodated30
- unbecomingness29
- uncollectibles28
- uncommonnesses27
- uncommunicable34
- uncomprehended30
- uncompromising31
- uncomputerized36
- unconformities26
- uncongeniality26
- unconscionable28
- unconscionably30
- unconsolidated23
- unconstructive28
- uncontaminated25
- uncontemplated28
- uncontemporary28
- uncontradicted25
- uncontrollable26
- uncontrollably28
- unconventional27
- unconvincingly34
- uncorroborated23
- undiscoverable28
- unincorporated24
- unrecognizable35
- unrecognizably37
- unreconcilable28
- videorecorders23
- watercolorists21