Vim - Search and replace the results

Question

I\'m getting more and more comfortable with Vim after a few months. BUT, there is only one simple feature I can\'t get any answer from the web. That is \"Search and replace the

Answer 1

Move to the first highlighted word then record a macro for replacing the word and moving to the next one, e.g:

gg
n
qq
caw new_word^[
n
q
@q
@@
@@
...