Ephemerid and Shadfly

Ephemerid noun - Short-lived insect.

Shadfly and ephemerid are semantically related. In some cases you can replace term "Shadfly" with "Ephemerid", this nouns are similar.

Shadfly noun - Slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days.

Ephemerid and shadfly are semantically related. You can use "Ephemerid" instead a noun "Shadfly".