Last letter = First Letter, min 3 syllable word chain

supercalifragilisticexpialidocious

stipulate

elephantopus

superceded

debonair

rambunctious

sensational

lambasted

demurring

gynecology

yammering

graciously

Ypsilanti

infantile

epigram

-“BB”-

mammogram

metronome

Extracurricular

regurgitated

devastated