Add a 7 letter word starting with the last letter from the previous word.
Diamond
Debrief
Firefly
yellows
Swallow
widened
Drunken
neither
Roughly
younger
Rancher
radiate
errands
Society
yuckier
Regular
rampage
earnest
Tumbler
radical
Longing
gambler
Rainbow
etsywin
Narwhal