leaf-miner vs leaf miner

leaf-miner and leaf miner both are nouns.

Word	Noun	Adjective	Verb	Adverb
leaf-miner	Yes	No	No	No
leaf miner	Yes	No	No	No

As nouns, leaf-miner and leaf miner are synonyms defined as:

leaf-miner and leaf miner: any of various small moths or dipterous flies whose larvae burrow into and feed on leaf tissue especially of the family Gracilariidae

leaf-miner (noun)	leaf miner (noun)
any of various small moths or dipterous flies whose larvae burrow into and feed on leaf tissue especially of the family Gracilariidae	any of various small moths or dipterous flies whose larvae burrow into and feed on leaf tissue especially of the family Gracilariidae