leaf-cutting bee vs leaf-cutter bee

leaf-cutting bee and leaf-cutter bee both are nouns.

Word	Noun	Adjective	Verb	Adverb
leaf-cutting bee	Yes	No	No	No
leaf-cutter bee	Yes	No	No	No

As nouns, leaf-cutting bee and leaf-cutter bee are synonyms defined as:

leaf-cutting bee and leaf-cutter bee: bee that cuts rounded pieces from leaves and flowers to line its nest

Other synonyms of leaf-cutting bee include leaf-cutter.

leaf-cutting bee (noun)	leaf-cutter bee (noun)
bee that cuts rounded pieces from leaves and flowers to line its nest	bee that cuts rounded pieces from leaves and flowers to line its nest