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

muscles

Celsius

calcium

calcify

flaccid

acidify

dulcify

crucify

Yeah, first offense…

crudity

recruit

critter

trickle

grackle

spackle

sparkle

snorkel

Kalorie

https://www.google.ca/amp/s/www.billboard.com/amp/articles/news/pride/8275817/kalorie-karbdashian-williams-drag-race-interview

realtor

reality

readily