Sialis lutaria vs alder fly

Sialis lutaria and alder fly both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sialis lutaria	Yes	No	No	No
alder fly	Yes	No	No	No

As nouns, Sialis lutaria and alder fly are synonyms defined as:

Sialis lutaria and alder fly: dark-colored insect having predaceous aquatic larvae

Other synonyms of Sialis lutaria include alderfly.

Sialis lutaria (noun)	alder fly (noun)
dark-colored insect having predaceous aquatic larvae	dark-colored insect having predaceous aquatic larvae