Last letter = First Letter, min 3 syllable word chain

Yakutat

Tuvalu

Ungulate

epiglottis

-“BB”-

silliest

triumphant

tamarack

keratin

-“BB”-

necrotic

Chasmaporthetes

silliness

sensibilities

sympathetic

commingling

-“BB”-

Galicia

acknowledgement

tarragon

nefarious

semiconductor

rudabaga