Last letter = First Letter, min 3 syllable word chain

impartiality

yellowish

hammerhead

diatomaceous

salamandroid

dodecahedron

Neurologist

Tanzania

axinomancy

youthfully

Yggdrasil

Llanfair­pwllgwyngyll­gogery­chwyrn­drobwll­llan­tysilio­gogo­goch

honorificabilitudinity

yeomanlike

equinox

xylotomy

Yosemite

ethereal

lackadaisical

luciferous