cw
To change a word, combine the c (change) command with w for word. You can replace a word (cw) with a longer or shorter word (or any amount of text). cw can be thought of as “delete the word marked and insert new text until ESC is pressed.”
cc
To replace the entire current line, use the special change command, cc. cc changes an entire line, replacing that line with any amount of text entered before pressing ESC . It doesn’t matter where the cursor is located on the line; cc replaces the entire line of text.
