14 letters
- recirculations23
- rectangularity24
- reformulations23
- regularization28
- reinoculations21
- remorsefulness23
- repopularizing34
- respectfulness26
- restimulations20
- revengefulness27
- ridiculousness22
- rightfulnesses24
- sansculottisms23
- scornfulnesses24
- scrupulosities23
- scrupulousness25
- secularization29
- sedulousnesses19
- sericulturists20
- shamefulnesses25
- silviculturist25
- simultaneities20
- simultaneously24
- skillfulnesses26
- skullduggeries27
- slothfulnesses23
- somnambulating29
- somnambulation27
- somnambulistic29
- soullessnesses18
- spitefulnesses23
- sportfulnesses23
- sprightfulness27
- strangulations20
- stultification23
- submandibulars28
- subpopulations27
- successfulness27
- sulfanilamides25
- sulfinpyrazone35
- summersaulting26
- superinsulated22
- supermasculine27
- superovulating27
- superovulation25
- superstimulate23
- supramolecular27
- tablespoonfuls27
- tablespoonsful27
- tastefulnesses20
- thankfulnesses27
- thermoregulate23
- thoughtfulness27
- thyroglobulins27
- tintinnabulary24
- triangulations20
- tristfulnesses20
- trustfulnesses21
- truthfulnesses23
- tumultuousness23
- ultimatenesses20
- ultimogeniture23
- ultracivilized34
- ultracompetent26
- ultradistances21
- ultraefficient26
- ultraenergetic22
- ultraexclusive32
- ultrafiltrates20
- ultraglamorous23
- ultrahazardous29
- ultramarathons22
- ultramasculine25
- ultramicrotome25
- ultramicrotomy27
- ultraminiature21
- ultramodernist21
- ultramontanism24
- ultrapatriotic22
- ultrapractical26
- ultraprecision23
- ultrarealistic20
- ultrarightists20
- ultraroyalists19
- ultrasensitive21
- ultrasonically24
- ultrastructure21
- ultraviolences25
- unacculturated26
- underpopulated26
- uneventfulness27
- unfaithfulness27
- unfruitfulness26
- ungratefulness24
- unlawfulnesses26
- unpopularities24
- unscrupulously29
- unskillfulness28
- unsuccessfully31
- untruthfulness25
- vengefulnesses27
- vermiculations27
- vernacularisms27
- vesicularities23
- viticulturally28
- viticulturists24
- voicefulnesses27
- vulcanisations25
- vulcanizations34
- vulcanologists27
- vulgarizations32
- vulnerableness26
- vulvovaginitis31
- wastefulnesses23
- watchfulnesses28
- wearifulnesses23
- worshipfulness28
- wrathfulnesses25
- wrongfulnesses26
- youthfulnesses25