21 Letter Words (YAWL)
| ACETYLCHOLINESTERASES | ADRENOCORTICOSTEROIDS |
| ADRENOCORTICOTROPHINS | ANTHROPOMORPHIZATIONS |
| ANTIAUTHORITARIANISMS | ANTIFERROMAGNETICALLY |
| BUCKMINSTERFULLERENES | CLINICOPATHOLOGICALLY |
| COMPARTMENTALISATIONS | COMPARTMENTALIZATIONS |
| CONSTITUTIONALIZATION | CONSUBSTANTIATIONISTS |
| CONTEMPORANEOUSNESSES | COUNTERCOUNTERMEASURE |
| COUNTERDEMONSTRATIONS | COUNTERINTERPRETATION |
| COUNTERPRODUCTIVENESS | COUNTERREVOLUTIONISTS |
| DENDROCHRONOLOGICALLY | DISADVANTAGEOUSNESSES |
| DISESTABLISHMENTARIAN | DISINDUSTRIALISATIONS |
| DISINDUSTRIALIZATIONS | DISPROPORTIONABLENESS |
| DISSATISFACTORINESSES | ECHOENCEPHALOGRAPHIES |
| ELECTROCARDIOGRAPHIES | ELECTROENCEPHALOGRAMS |
| ELECTROENCEPHALOGRAPH | ELECTROMYOGRAPHICALLY |
| ELECTRORETINOGRAPHIES | ESTABLISHMENTARIANISM |
| EXTRATERRITORIALITIES | HYPERCHOLESTEROLAEMIA |
| HYPERCHOLESTEROLEMIAS | HYPERSUSCEPTIBILITIES |
| IMMUNOCYTOCHEMISTRIES | IMMUNOELECTROPHORESES |
| IMMUNOELECTROPHORESIS | IMMUNOELECTROPHORETIC |
| INCOMMENSURABLENESSES | INCOMMUNICATIVENESSES |
| INCOMPREHENSIBILITIES | INCOMPREHENSIVENESSES |
| INCONSEQUENTIALNESSES | INCONTROVERTIBILITIES |
| INDISTINGUISHABLENESS | INSTITUTIONALISATIONS |
| INSTITUTIONALIZATIONS | INTELLECTUALISTICALLY |
| INTERCHANGEABLENESSES | INTERCONVERTIBILITIES |
| INTERNATIONALISATIONS | INTERNATIONALIZATIONS |
| INTERSUBSTITUTABILITY | IRREPREHENSIBLENESSES |
| MENINGOENCEPHALITIDES | MICROMINIATURISATIONS |
| MICROMINIATURIZATIONS | MICROPALAEONTOLOGISTS |
| MISAPPREHENSIVENESSES | MULTIDIMENSIONALITIES |
| NEUROENDOCRINOLOGICAL | NEUROENDOCRINOLOGISTS |
| NONDENOMINATIONALISMS | OTORHINOLARYNGOLOGIES |
| OTORHINOLARYNGOLOGIST | OVERCOMMERCIALIZATION |
| OVERINTELLECTUALIZING | PALAEOANTHROPOLOGICAL |
| PALAEOANTHROPOLOGISTS | PHOSPHOGLYCERALDEHYDE |
| PHOTOLITHOGRAPHICALLY | PHOTOPHOSPHORYLATIONS |
| POLUPHLOISBOIOTATOTIC | PROCRASTINATIVENESSES |
| PSEUDOCHOLINESTERASES | PSEUDOHERMAPHRODITISM |
| PSEUDOSOPHISTICATIONS | PSYCHONEUROIMMUNOLOGY |
| PSYCHOPHARMACOLOGICAL | PSYCHOPHARMACOLOGISTS |
| PSYCHOPHYSIOLOGICALLY | PSYCHOTHERAPEUTICALLY |
| REPRESENTATIONALISTIC | STEREOMICROSCOPICALLY |
| STRAIGHTFORWARDNESSES | TETRAHYDROCANNABINOLS |
| TRANSUBSTANTIATIONIST | ULTRAMICROCHEMISTRIES |
| ULTRAMINIATURIZATIONS | UNCOMMUNICATIVENESSES |
| UNCONSCIENTIOUSNESSES | UNCONSTITUTIONALITIES |
| UNDEMONSTRATIVENESSES | UNDISTINGUISHABLENESS |
| UNEXCEPTIONABLENESSES | UNSELFCONSCIOUSNESSES |
| UNSOPHISTICATEDNESSES |