How to replace string to node

Question

I want to replace string to node.

paragraph = document.getElementById('paragraph ')
word = document.getElementById('word')
val = paragraph.childNodes[0].nodeValue
paragraph.innerHTML = val.replace(/text\s/, word)

something like this.

Answer 1

Если правильно понял то это как то вроде так:
paragraph.innerHTML = '';
paragraph.append(word);