Last letter = First Letter, min 3 syllable word chain

naturalization

neighborly

Yenisei

(I thought of yttrium first, but according to the search function it’s been used 12 times in the thread)

idiotproof

finalize

exceeding

geriatric

counselor

rococo

ominous

staccato

outstanding

grandiose

electrolysis

sympathetic

compassion

Nitpicking

gluttonous

sybaritic

crocodile