If i need to optimize page for the keyphrase which consists of 4 words
e.g. "keyword density best practice".
What if the the keyword density of the phrase "keyword density" is over optimized(e.g.40%).
Would keyword stuffing for "keyword density" phrase be considered while ranking page for the query "keyword density best practice"?
Yes it will affect the "keyword density". and remember the keywords stuffing has diminishing return, If you are a keyword twice or thrice it will give you juice but after that it will not until it start effecting your website in negative direction. I suggest that you should use exact keyword only once that try to diversity by using keyword in way like "best practice for keyword density"
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