Words That Rhyme With "Gastrointestinal" :
3 syllables:
4 syllables:
arrestable, concessional, confessional, congressional, coprostanol, discretional, investable, obsessional, precessional, processional, professional, recessional
5 syllables:
nonprofessional, unprofessional
6 syllables:
extraprofessional, interconfessional, paraprofessional, semiprofessional