shadfly vs dayfly

shadfly and dayfly both are nouns.

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

As nouns, shadfly and dayfly are synonyms defined as:

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

Other synonyms of shadfly include mayfly.

shadfly (noun)	dayfly (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