15 letters
- remanufacturing30
- resectabilities22
- respectableness26
- restrictionisms22
- restrictionists19
- restrictiveness23
- resurrectionist20
- retroactivities22
- retroreflection23
- retroreflective26
- retroreflectors22
- retrospectively28
- sacrosanctities22
- sanctifications26
- sanctimoniously27
- seductivenesses25
- selectivenesses24
- semiabstraction25
- spectrographies28
- spectroscopists27
- splenectomizing38
- structuralizing33
- subcontraoctave30
- superactivities26
- superconducting31
- superconductive32
- superconductors28
- superinductions26
- superinfections27
- superspectacles29
- superstructural25
- superstructures24
- sympathectomies31
- technostructure26
- telangiectasias22
- thermojunctions35
- thyroidectomies26
- tonsillectomies24
- tractablenesses23
- trisoctahedrons22
- ultrastructural23
- ultrastructures22
- underactivities25
- underproduction27
- unobjectionable37
- unpunctualities27
- unreconstructed26
- vasoconstrictor26
- vivisectionists27