capsid vs lygus bug

capsid and lygus bug both are nouns.

Word	Noun	Adjective	Verb	Adverb
capsid	Yes	No	No	No
lygus bug	Yes	No	No	No

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

Other hyponyms of capsid include four-lined leaf bug, four-lined plant bug, Poecilocapsus lineatus.

capsid (noun)	lygus bug (noun)
the outer covering of protein surrounding the nucleic acid of a virus	vector of viral plant diseases
a variety of leaf bug