One Word - Plus Minus Change Game

[KamaluNg]

A quick word game.
The rules are simple, from the previous word you may add one letter or take away one letter anywhere in the word or change any one letter, you may choose only one option to add, take or change however you must leave a valid word.

Examples.
If the starter word is SPIT.
You might change letter, result = SPOT
or take a letter, result = PIT
or add a letter, result = SPLIT.

Starter word

CAST.