mayfish vs may fish

mayfish and may fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
mayfish	Yes	No	No	No
may fish	Yes	No	No	No

As nouns, mayfish and may fish are synonyms defined as:

mayfish and may fish: black-barred fish of bays and coastal marshes of the Atlantic and Gulf Coast of the United States

Other synonyms of mayfish include Fundulus majalis, striped killifish.

mayfish (noun)	may fish (noun)
black-barred fish of bays and coastal marshes of the Atlantic and Gulf Coast of the United States	black-barred fish of bays and coastal marshes of the Atlantic and Gulf Coast of the United States