No, I mean to illustrate that "blue" and "knowledge" have a vastly different degree in variation in definition. Like you say, all words of course have differen

No, I mean to illustrate that "blue" and "knowledge" have a vastly different degree in variation in definition. Like you say, all words of course have different definitions between individuals, but you and I are obviously able to communicate without specifying every definition. There exists a spectrum between well-agreed-upon definitions (like "and") and fuzzier ones. The definition of "knowledge" is divisive enough that many people disagree vehemently on definitions, which is illustrated by the fact that there is a whole Wikipedia article on it. If there is a "midwit trap" related to this, there is certainly a Sorites paradox trap as well - that because all words have varying definitions, that it is no use to point out that some words' definitions are more variable than others.