Flippign Lettesr Aroudn
V, 4 5 bytes

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|| denotes the cursor

The buffer starts with |w|ord and more words and the cursor being on the first character.

Recursively ò

go to the end of a word

wor|d| and more words

remove X the character to the left of the cursor

wo|d| and more words

paste it over the next character

wod|r| and more words

Implicit ending ò, repeat the same process for other words until the end of the buffer is reached