In taxonomy terms the difference between superorder and infraclass
is that superorder is a taxonomic category below subclass and above order while infraclass is a zoological classification sometimes inserted below subclass and above superorder.
superorder
English
Noun
(
en noun)
(taxonomy) A taxonomic category below subclass and above order.
infraclass
English
Noun
(es)
(taxonomy) A zoological classification sometimes inserted below subclass and above superorder