Bullhead
Definition 1 of 2

Specificity
The term 'bullhead' refers specifically to a group of catfish; it’s important to distinguish it from other fish

Not all freshwater fish are bullheads.
Context
When discussing fishing, using 'bullhead' precisely indicates the species being referred to

Be clear to avoid confusion.
Metaphor
In describing a stubborn person as a 'bullhead', it suggests a lack of flexibility

This is a figurative use.
Compare with
catfishstubbornfishwild
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