Kingfish vs Undefined - What's the difference?

As a noun kingfish

is any of several food fishes of the genus from the atlantic; kingcroaker.

lacking a definition or value.

(wikipedia kingfish)

Any of several food fishes of the genus from the Atlantic; kingcroaker

Other Atlantic fish

# opah (United Kingdom)

# white croaker (United Kingdom)

# wahoo (Barbados)

# (king mackerel)

Any of several similar fishes of the Pacific.

# (narrow-barred Spanish mackerel) (Australia)

# (Japanese meagre) (Australia)

# yellowtail amberjack Seriola lalandi (Australia, New Zealand)

# (silver gemfish) (Australia)

Caranx

# (crevalle jack) (Mauritania)

# (giant trevally) (sometimes travelli ) (South Africa)

cobia, Rachycentron canadum , of warm waters globally.

(wikipedia undefined) (-)

Lacking a definition or value.

(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

The result of division by zero is undefined .

* defined