leaf bug vs mirid bug

leaf bug and mirid bug both are nouns.

Word	Noun	Adjective	Verb	Adverb
leaf bug	Yes	No	No	No
mirid bug	Yes	No	No	No

As nouns, mirid bug is a hyponym of leaf bug; that is, mirid bug is a word with a more specific, narrower meaning than leaf bug:

Other hyponyms of leaf bug include capsid, mirid, lace bug.

leaf bug (noun)	mirid bug (noun)
small bright-colored insect that feeds on plant juices	a variety of leaf bug