If no single set of features is logically critical across all instances of a concept, then identifying 'critical features' in the source domain presupposes an essentialism that many domains structurally lack.

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Essentialism(One of three groupings used to categorize approaches to linguistic theorizing): One of three characterizations of linguistic theorizing; includes both Katz's platonism and Chomskyan I-language advocates
Presupposes(as describing what Plantinga's argument takes for granted): Assumes something to be true without proving it—like how an argument might presuppose that logic works, without first arguing that logic is valid.
instances of a concept(referring to specific examples of the thing being defined): Individual examples or cases of something you're trying to define—like 'a robin' and 'a penguin' are both instances of the concept 'bird.'
logically critical(describing features that seem necessary to define something): Something that must be true or present for a concept to count as itself—like how 'having wings' might seem critical to being a bird, but penguins are still birds without functioning wings.
source domain(Formal structure of analogical arguments): The domain S from which the analogical inference is drawn; a set of objects, properties, relations and functions together with a set of accepted statements about those objects, properties, relations and functions.

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