Dayfly and Mayfly

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

Mayfly is a synonym for dayfly. In some cases you can use "Mayfly" instead a noun "Dayfly".

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

Dayfly is a synonym for mayfly. You can use "Dayfly" instead a noun "Mayfly".