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

grinnel

Oops! too slow this morning. Grinnel was for ringing.

For Biffter’s pinging:

ginning

pinning

ninepin

impinge

comping

combine

Bitcoin

cohabit

habitat

agitate

glitter

relight

freight

fraught

naughty

ghastly

hastily

tacitly

nuttily