four-lined leaf bug vs four-lined plant bug

four-lined leaf bug and four-lined plant bug both are nouns.

Word	Noun	Adjective	Verb	Adverb
four-lined leaf bug	Yes	No	No	No
four-lined plant bug	Yes	No	No	No

As nouns, four-lined leaf bug and four-lined plant bug are synonyms defined as:

four-lined leaf bug and four-lined plant bug: yellow or orange leaf bug with four black stripes down the back; widespread in central and eastern North America

Other synonyms of four-lined leaf bug include Poecilocapsus lineatus.

four-lined leaf bug (noun)	four-lined plant bug (noun)
yellow or orange leaf bug with four black stripes down the back; widespread in central and eastern North America	yellow or orange leaf bug with four black stripes down the back; widespread in central and eastern North America