Cimex lectularius vs hemipteran

Cimex lectularius and hemipteran both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cimex lectularius	Yes	No	No	No
hemipteran	Yes	No	No	No

As nouns, hemipteran is a hypernym of Cimex lectularius; that is, hemipteran is a word with a broader meaning than Cimex lectularius:

Cimex lectularius: bug of temperate regions that infests especially beds and feeds on human blood
hemipteran: insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis

Other hypernyms of Cimex lectularius include bug, hemipteron, hemipterous insect.

Cimex lectularius (noun)	hemipteran (noun)
bug of temperate regions that infests especially beds and feeds on human blood	insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis