Metaphorical classes arise from different analytical dimensions. One may ask whether the shared respect is sensory or conceptual, whether the borrowed expression is an underived noun or a derivative, or whether related expressions accompany it.
Calling a luminous face a sun can emphasize visible brilliance. Calling a distinguished benefactor a sun can concern eminence and broad benefit.
The borrowed noun is the same, but its operative resemblance and rhetorical purpose depend on context.
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Literal and Figurative Usage: Metonymy and Types of Metaphor
Metaphorical classes arise from different analytical dimensions. One may ask whether the shared respect is sensory or conceptual, whether the borrowed expression is an underived noun or a derivative, or whether related expressions accompany it.
Calling a luminous face a sun can emphasize visible brilliance. Calling a distinguished benefactor a sun can concern eminence and broad benefit.
The borrowed noun is the same, but its operative resemblance and rhetorical purpose depend on context.