Seven letter words change one or two letter to make a new word

sparkly

speaker

spanked

spelunk

Sputnik

nitpick

kitchen

kitschy

sketchy

ketchup

chuckle

truckle

trickle

tracked

darkens

snarkey

Barkley
(Gnarls Barkley, that is)

Tarpley

(In Texas. Eat here; goat burger is the best)

traipse

Spiders!