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

service

victors

convict

connect

concern

corner

Corner only has six letters. Playing off of concern:

concert
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concept

convict

concise

incisor

soaring

arsenic

askance

knacker

slacker

caramel

melanin

camelid

Melanin can’t be made from caramel in 2; you need 2 n’s and an i.

Playing off camelid.

Camelot