19 letters
- photodisintegration29
- photofluorographies36
- photointerpretation29
- photoreconnaissance33
- phytogeographically42
- polychromatophilias39
- polyesterifications32
- polyribonucleotides35
- postmillenarianisms32
- posttranscriptional31
- prefigurativenesses33
- preternaturalnesses26
- professionalization37
- proletarianizations34
- psychopharmacologic46
- radioallergosorbent28
- radiopharmaceutical36
- reconceptualization41
- reindustrialization33
- reinstitutionalized33
- reinstitutionalizes32
- reprehensiblenesses30
- representationalism28
- representationalist25
- reticuloendothelial30
- revolutionarinesses27
- spectrofluorimeters33
- spectrofluorometers33
- spectrofluorometric36
- spectrophotometries33
- splendiferousnesses30
- stereophotographies31
- stereospecificities31
- straightforwardness31
- structurelessnesses26
- superadministrators28
- superconductivities36
- superspecialization40
- tenderheartednesses25
- territorializations30
- thermoelectricities31
- thermoluminescences37
- thermoperiodicities31
- transformationalist28
- transmogrifications32
- transplantabilities29
- transubstantiations26
- tridimensionalities26
- ultracentrifugation32
- ultracontemporaries31
- ultrasegregationist26
- unapproachabilities36
- unceremoniousnesses30
- uncontrollabilities31
- undemonstrativeness31
- underrepresentation27
- understandabilities28
- unpretentiousnesses27
- untranslatabilities27