lygaeid vs hemipterous insect

lygaeid and hemipterous insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
lygaeid	Yes	No	No	No
hemipterous insect	Yes	No	No	No

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

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

Other hypernyms of lygaeid include bug, hemipteran, hemipteron.

lygaeid (noun)	hemipterous insect (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