Last letter = First Letter, min 3 syllable word chain

endogenous

superlative

economical

lascivious

serendipitous

sociopath

heterogeneous

suppurating

gurgitate

egregious

superluminal

latifundium

microscopic

charivari

incomprehensible

elephantiac

Coruscating

gargantuan

nepotism

marshmallow