planthopper vs homopteran

planthopper and homopteran both are nouns.

Word	Noun	Adjective	Verb	Adverb
planthopper	Yes	No	No	No
homopteran	Yes	No	No	No

As nouns, homopteran is a hypernym of planthopper; that is, homopteran is a word with a broader meaning than planthopper:

planthopper: related to the leafhoppers and spittlebugs but rarely damages cultivated plants
homopteran: insects having membranous forewings and hind wings

Other hypernyms of planthopper include homopterous insect.

planthopper (noun)	homopteran (noun)
related to the leafhoppers and spittlebugs but rarely damages cultivated plants	insects having membranous forewings and hind wings