Last letter = First Letter, min 3 syllable word chain

Natalie

exculpate

exterminate

euthanasia

-“BB”-

Aethelred

directionless

simpleton

notorious

sacrosanct

twenty-third

dystopian

ninety-ninth

homeopath

hovercraft

-“BB”-

Thallium

melodic

calliope

enterprising

gargantuan

Nairobi