Moonfish \Moon"fish`\, n. (Zo["o]l.)
   (a) An American marine fish (Vomer setipennis); -- called also bluntnosed shiner, horsefish, and sunfish.
   (b) A broad, thin, silvery marine fish (Selene vomer); -- called also lookdown, and silver moonfish.
   (c) The mola. See Sunfish, 1.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Sunfish \Sun"fish`\, n. (Zo["o]l.)
   (a) A very large oceanic plectognath fish (Mola mola, Mola rotunda, or Orthagoriscus mola) having a broad body and a truncated tail.
   (b) Any one of numerous species of perch-like North American fresh-water fishes of the family Centrachid[ae]. They have a broad, compressed body, and strong dorsal spines. Among the common species of the Eastern United States are Lepomis gibbosus (called also bream, pondfish, pumpkin seed, and sunny), the blue sunfish, or dollardee (L. pallidus), and the long-eared sunfish (L. auritus). Several of the species are called also pondfish.
   (c) The moonfish, or bluntnosed shiner.
   (d) The opah.
   (e) The basking, or liver, shark.
   (f) Any large jellyfish.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Pondfish \Pond"fish`\, n. (Zo["o]l.) Any one of numerous species of American fresh-water fishes belonging to the family Centrarchid[ae]; -- called also pond perch, and sunfish.

Note: The common pondfish of New England (Lepomis gibbosus) is called also bream, pumpkin seed, and sunny. See Sunfish. The long-eared pondfish (Lepomis auritus) of the Eastern United States is distinguished by its very long opercular flap.

Source: Webster's Revised Unabridged Dictionary (1913)