15 letters
- predevelopments31
- pronunciamentos28
- psychometrician32
- psychotomimetic34
- quarrelsomeness30
- radiometrically26
- radiotelemetric23
- reapportionment26
- recommencements32
- recommendations27
- reestablishment25
- reflectometries25
- refractometries24
- relinquishments33
- remediabilities23
- rememberability30
- rudimentariness22
- sabermetricians25
- sacramentalisms26
- sacramentalists23
- schlockmeisters31
- scintillometers24
- sedimentologies23
- sedimentologist23
- semidocumentary29
- semiretirements22
- semisubmersible29
- sentimentalised22
- sentimentalises21
- sentimentalisms24
- sentimentalists21
- sentimentalized31
- sentimentalizes30
- servomechanisms31
- shamelessnesses22
- sledgehammering30
- stereoisomerism21
- stoichiometries23
- subdevelopments32
- submetacentrics29
- supergovernment30
- supernumeraries24
- superphenomenon30
- supersymmetries27
- supplementation28
- symmetricalness28
- symmetrizations33
- sympathomimetic34
- tarsometatarsus19
- temerariousness20
- temperamentally29
- tetramethyllead25
- toothsomenesses21
- transmissometer22
- trigonometrical25
- trihalomethanes24
- troublesomeness24
- ultracommercial30
- ultramicrotomes26
- uncomplimentary33
- underemployment31
- underinvestment27
- understatements22
- unmelodiousness24
- unparliamentary27
- unsymmetrically32
- venturesomeness25
- wearisomenesses22
- wholesomenesses25
- worrisomenesses22