Last letter = First Letter, min 3 syllable word chain

scintillating

grandstanding

Granfalloon

navigational

(Never heard of a granfalloon before - interesting, thanks!)

labyrinth

Hippocrates

Socrates

stammering

galluses

-“BB”-

stroganoff

flexible

Excedrin

neonym

memento

ontological

Lachesis

sequester

rediculous

semaphore

exasperated