bed bug vs Cimex lectularius

bed bug and Cimex lectularius both are nouns.

Word	Noun	Adjective	Verb	Adverb
bed bug	Yes	No	No	No
Cimex lectularius	Yes	No	No	No

As nouns, bed bug and Cimex lectularius are synonyms defined as:

bed bug and Cimex lectularius: bug of temperate regions that infests especially beds and feeds on human blood

Other synonyms of bed bug include bedbug, chinch.

bed bug (noun)	Cimex lectularius (noun)
bug of temperate regions that infests especially beds and feeds on human blood	bug of temperate regions that infests especially beds and feeds on human blood