mayfly vs shadfly

mayfly and shadfly both are nouns.

Word	Noun	Adjective	Verb	Adverb
mayfly	Yes	No	No	No
shadfly	Yes	No	No	No

As nouns, mayfly and shadfly are synonyms defined as:

mayfly and shadfly: slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days

Other synonyms of mayfly include dayfly.

mayfly (noun)	shadfly (noun)
slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days	slender insect with delicate membranous wings having an aquatic larval stage and terrestrial adult stage usually lasting less than two days