Use placeholder text for space, not meaning
Choose the amount and output format. Words gives an exact word count. Sentences uses a fixed sentence length; paragraphs and list items use the words-per-item setting. HTML output wraps the same text in the corresponding elements.
A worked example
Choose 12 words to make a compact sample. Switch to HTML to get a paragraph containing those same 12 words.
Before you use the result
The word bank repeats. Use real representative copy to check headings, form labels, translation, or how readers understand a page. Latin filler cannot answer those questions. Count your finished copy when you replace the placeholder.