I'm not really an expert in the field, but you might consider the circumstances: Are you just angry -- straining -- struggling, or are you getting ready to kiss someone? The first would be pursing and the second would be puckering.
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SignOff------------------------------------------------Thank you, enoon!So, what would puckered lips look like compared to pursed lips?Any difference is not inherent in the two words. They are about as close to true synonyms as two English words can be. It's just that we tend to use "pucker (up)" for kissy lips and "purse" for Gordon Brown, whom no one wants