lygaeid bug vs hemipteran

lygaeid bug and hemipteran both are nouns.

Word	Noun	Adjective	Verb	Adverb
lygaeid bug	Yes	No	No	No
hemipteran	Yes	No	No	No

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

lygaeid bug: a true bug: usually bright-colored; pest of cultivated crops and some fruit trees
hemipteran: insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis

Other hypernyms of lygaeid bug include bug, hemipteron, hemipterous insect.

lygaeid bug (noun)	hemipteran (noun)
a true bug: usually bright-colored; pest of cultivated crops and some fruit trees	insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis