Cnidarian is a hypernym of hydractinian.
As nouns the difference between cnidarian and hydractinian
is that cnidarian is any of various invertebrate animals, such as jellyfish, hydras, sea anemones, corals and formerly sponges and ctenophores that belong to the phylum cnidaria while hydractinian is (biology) a marine hydroid of the genus (taxlink) or a closely-related genus.
cnidarian
English
Noun
(
en noun)
any of various invertebrate animals, such as jellyfish, hydras, sea anemones, corals and formerly sponges and ctenophores that belong to the phylum Cnidaria .
See also
* coelenterate
hydractinian
English
Noun
(
en noun)
(biology) A marine hydroid of the genus (taxlink) or a closely-related genus
Hypernyms
*hydractiniid
*hydrozoan
*cnidarian
*animal
*eukaryote
*organism