[1] : The Collaborative International Dictionary of English v.0.48

chub \chub\, n. this word seems to signify a large or thick
   fish. cf. sw. kubb a short and thick piece of wood, and perh.
   f. chabot chub. zool.
   a species to fresh-water fish of the cyprinidae or carp
   family. the common european species is leuciscus cephalus;
   the cheven. in america the name is applied to various fishes
   of the same family, of the genera semotilus, squalius,
   ceratichthys, etc., and locally to several very different
   fishes, as the tautog, black bass, etc.
   1913 webster

   chub mackerel zool., a species of mackerel scomber
      colias in some years found in abundance on the atlantic
      coast, but absent in others; -- called also bull
      mackerel, thimble-eye, and big-eye mackerel.

   chub sucker zool., a fresh-water fish of the united
      states erimyzon sucetta; -- called also creekfish.
      1913 webster
see also:
cyprinidae leuciscus cephalus semotilus squalius ceratichthys tautog 
black bass chub mackerel scomber colias bull mackerel thimble-eye 
big-eye mackerel chub sucker erimyzon sucetta creekfish 

Sucker >> S Words
Sucker, definition of term: Sucker
sucker_pag1.html

Chub >> C Words
Chub, definition of term: Chub
chub_pag1.html