The difference between Roughy and Slimehead
When used as nouns, roughy means the orange roughy, , whereas slimehead means any of the long-lived deep-sea fish forming the family .
check bellow for the other definitions of Roughy and Slimehead
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Roughy as a noun (Australia):
A fish in family The orange roughy, . Any of several marine fish of the related genus , which have rough and spiny scales.
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Slimehead as a noun:
Any of the long-lived deep-sea fish forming the family .