actinian vs sea anemone

actinian and sea anemone both are nouns.

Word	Noun	Adjective	Verb	Adverb
actinian	Yes	No	No	No
sea anemone	Yes	No	No	No

As nouns, sea anemone is a hypernym of actinian; that is, sea anemone is a word with a broader meaning than actinian:

actinian: any sea anemone or related animal
sea anemone: marine polyps that resemble flowers but have oral rings of tentacles; differ from corals in forming no hard skeleton

Other hypernyms of actinian include anemone.

actinian (noun)	sea anemone (noun)
any sea anemone or related animal	marine polyps that resemble flowers but have oral rings of tentacles; differ from corals in forming no hard skeleton