lygaeid bug vs hemipteron

lygaeid bug and hemipteron both are nouns.

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

As nouns, hemipteron is a hypernym of lygaeid bug; that is, hemipteron 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
hemipteron: insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis

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

lygaeid bug (noun)	hemipteron (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