What the numbers mean
For English the score is Flesch reading ease: higher is easier, and 60 to 70 is conventionally read as plain English. For Turkish it's Ateşman's formula, an adaptation of Flesch for Turkish word lengths, read the same way.
Both formulas only count sentence length and syllables per word. They can't tell whether a text is correct, original or useful, so treat a low score as a prompt to look at your sentences, not as a verdict.
Word count and AdSense
Google doesn't set a minimum word count for AdSense or for Search. What reviewers look for is enough original content to understand and evaluate the site. A 600-word post that answers its question beats a 2,000-word one padded to hit a number.
The count still helps in one place: very short posts across a whole site often mean there isn't much to evaluate yet. Our guide on words per post goes through it.
Repeated phrases
Three-word phrases used three or more times are listed. A few are normal (a product name, a term you define). A long list usually means template sentences or a keyword pushed into every paragraph, both of which read badly and are what Google's spam policies call keyword stuffing when taken far.