RichThesaurus
ephemerid
vs
ephemeropteran
ephemerid
noun
Any mayfly in the family Ephemeridae.
ephemeropteran
noun
Any insect of the order Ephemeroptera, the mayflies.
How often have the words
ephemerid
and
ephemeropteran
occurred in a corpus of books?
(source:
Google Ngram Viewer
)