12 letters
- extramusical27
- extraneously24
- extranuclear25
- extrapolated24
- extrapolates23
- extrapolator23
- extrasensory22
- extrasystole22
- extratextual28
- extrauterine21
- extravagance29
- extravagancy31
- extravaganza35
- extravagated26
- extravagates25
- extravasated24
- extravasates23
- extraversion24
- extrications23
- extroversion24
- flexographic33
- fluidextract28
- fucoxanthins30
- googolplexes28
- hematoxylins28
- heteroauxins23
- heterodoxies22
- heteroduplex27
- heterosexual23
- hexadecimals29
- hexahydrates26
- hexaploidies26
- hexobarbital28
- homosexually29
- hydroxylases27
- hydroxylated28
- hydroxylates27
- hydroxyureas27
- hydroxyzines36
- hypercomplex36
- hyperexcited30
- hyperextends28
- hyperpyrexia31
- hypoxanthine30
- inexactitude25
- inexistences24
- inexpedience28
- inexpediency30
- inexperience27
- inexpertness24
- inexplicable31
- inexplicably33
- inexpressive27
- inexpugnable31
- inexpugnably33
- inexpungible31
- inextricable27
- inextricably29
- inheritrixes22
- intermixture24
- intertextual22
- intoxicating26
- intoxication24
- letterboxing26
- lexicalities24
- lexicalizing36
- lexicography32
- lexicologies26
- lexicologist26
- lixiviations25
- maximization35
- mesothoraxes24
- metagalaxies25
- metathoraxes24
- methotrexate24
- methoxychlor32
- morphallaxes29
- morphallaxis29
- multiplexers28
- multiplexing31
- multiplexors28
- myxedematous29
- neoorthodoxy25
- nonexclusive30
- nonexecutive29
- nonexistence25
- nonexplosive29
- nonoxidizing34
- oropharynxes27
- overexciting29
- overexercise26
- overexerting26
- overexertion24
- overexpanded29
- overexplains28
- overexplicit30
- overexploits27
- overexposing29
- overexposure27
- overextended26
- overtaxation24
- oxalacetates23
- oxaloacetate23
- oxyacetylene28
- oxygenations25
- pansexuality27
- perplexities26
- photoexcited28
- photooxidize34
- phyllotaxies28
- phytoalexins28
- pneumothorax29
- portmanteaux27
- postexercise25
- postexposure26
- praxeologies25
- preexistence26
- premaxillary29
- propoxyphene33
- psychosexual31
- pyridoxamine29
- quixotically36
- reannexation22
- reexperience26
- reexpressing25
- reoxidations21
- retroflexion24
- saxophonists25
- semiflexible30
- sexagenarian23
- sexagesimals25
- sexdecillion26
- sextodecimos26
- sextuplicate27
- shadowboxing31
- subluxations26
- submaxillary30
- suffixations27
- superexpress26
- superhelixes26
- taxidermists23
- tetrodotoxin21
- thixotropies24
- thromboxanes28
- toxicologies25
- toxicologist25
- toxigenicity27
- toxophilites25
- transfixions24
- transsexuals22
- trophallaxes26
- trophallaxis26
- underexposed26
- underexposes25
- unexpectedly31
- unexpressive28
- unexpurgated28
- unisexuality25
- unnilhexiums29
- unorthodoxly27
- unoxygenated27
- uxoriousness22
- vexillologic31
- xanthophylls31
- xerographies26
- xerophytisms29
- xiphisternum29
- xylographers29
- xylographies29
- xylophonists28
- zooxanthella33