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

smelter

Swelter

stalker

lurkers

skulker

silkier

lustier

results (and wouldn’t “silkier, lustier results” be great slogan for a hair care product)

re

tresses

It would at that

actress

reactor

You don’t know what tresses means?

creator

recants

Why do you ask that, Jane?

casting

stinger

I must have misunderstood something.

grunter

regrets