The difference between Echidna and Porcupine
When used as nouns, echidna means any of the species of small spined monotremes in family tachyglossidae, the four extant species of which are found in australia and southern new guinea, whereas porcupine means any of several rodents of either of the taxonomic families hystricidae (old world porcupines) or erethizontidae (new world porcupines), both from the infraorder hystricognathi, noted for their sharp spines or quills, which are raised when the animal is attacked or surprised.
check bellow for the other definitions of Echidna and Porcupine
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Echidna as a noun:
Any of the species of small spined monotremes in family Tachyglossidae, the four extant species of which are found in Australia and southern New Guinea.
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Porcupine as a noun:
Any of several rodents of either of the taxonomic families Hystricidae (Old World porcupines) or Erethizontidae (New World porcupines), both from the infraorder Hystricognathi, noted for their sharp spines or quills, which are raised when the animal is attacked or surprised.