12 letters
- inexactitude25
- inexistences24
- inexpedience28
- inexpediency30
- inexperience27
- inexpertness24
- inexplicable31
- inexplicably33
- inexpressive27
- inexpugnable31
- inexpugnably33
- inexpungible31
- inextricable27
- inextricably29
- intertextual22
- lexicalities24
- lexicalizing36
- lexicography32
- lexicologies26
- lexicologist26
- methotrexate24
- multiplexers28
- multiplexing31
- multiplexors28
- nonexclusive30
- nonexecutive29
- nonexistence25
- nonexplosive29
- overexciting29
- overexercise26
- overexerting26
- overexertion24
- overexpanded29
- overexplains28
- overexplicit30
- overexploits27
- overexposing29
- overexposure27
- overextended26
- pansexuality27
- perplexities26
- photoexcited28
- phytoalexins28
- postexercise25
- postexposure26
- preexistence26
- psychosexual31
- reannexation22
- reexperience26
- reexpressing25
- retroflexion24
- semiflexible30
- sexagenarian23
- sexagesimals25
- sexdecillion26
- sextodecimos26
- sextuplicate27
- superexpress26
- transsexuals22
- underexposed26
- underexposes25
- unexpectedly31
- unexpressive28
- unexpurgated28
- unisexuality25
- unnilhexiums29
- vexillologic31