15 letters
- interventionist22
- intervisibility26
- intervisitation21
- intolerableness22
- intracellularly26
- intracerebrally26
- intramuscularly28
- intransigeances23
- intransigeantly23
- intraperitoneal21
- intrapopulation25
- intrapreneurial22
- intravascularly28
- intricatenesses20
- introspectional24
- introspectively29
- intrusivenesses22
- intuitivenesses22
- intussuscepting27
- intussusception25
- intussusceptive28
- invariabilities24
- invectivenesses28
- inventivenesses26
- investigational24
- invidiousnesses23
- invincibilities28
- inviolabilities25
- inviolatenesses22
- invisiblenesses25
- involuntariness24
- invulnerability29