The difference between blowfish and pufferfish

is that "blowfish" is any species of fish of the family Tetraodontidae that have the ability to inflate themselves to a globe several times their normal size by swallowing water or air when threatened and "pufferfish" is any species of fish of the family Tetraodontidae that have the ability to inflate themselves to a globe several times their normal size by swallowing water or air when threatened; puffer, blowfish, swellfish, balloonfish, globefish.

blowfish

pufferfish

Noun

Any species of fish of the family Tetraodontidae that have the ability to inflate themselves to a globe several times their normal size by swallowing water or air when threatened.
A delicacy popular in Japan, consisting of the fish served raw as sushi or perhaps fried. It may, if improperly prepared, contain considerably deadly levels of neurotoxins.

Synonyms

(fish): balloonfish, globefish, puffer, pufferfish, swellfish
(food): fugu

wiki:blowfish

Noun

Any species of fish of the family Tetraodontidae that have the ability to inflate themselves to a globe several times their normal size by swallowing water or air when threatened; puffer, blowfish, swellfish, balloonfish, globefish.
A delicacy popular in Japan served raw as sushi that may, if improperly prepared, contain deadly levels of neurotoxins; (Japanese) fugu.

Synonyms

(fish): balloonfish, blowfish, globefish, puffer, swellfish
(dish): fugu

wiki:pufferfish