peridinian vs dinoflagellate

peridinian and dinoflagellate both are nouns.

Word	Noun	Adjective	Verb	Adverb
peridinian	Yes	No	No	No
dinoflagellate	Yes	No	No	No

As nouns, dinoflagellate is a hypernym of peridinian; that is, dinoflagellate is a word with a broader meaning than peridinian:

peridinian: flagellate with a thick test composed of plates
dinoflagellate: chiefly marine protozoa having two flagella; a chief constituent of plankton

peridinian (noun)	dinoflagellate (noun)
flagellate with a thick test composed of plates	chiefly marine protozoa having two flagella; a chief constituent of plankton