orthomyxovirus vs myxovirus

orthomyxovirus and myxovirus both are nouns.

Word	Noun	Adjective	Verb	Adverb
orthomyxovirus	Yes	No	No	No
myxovirus	Yes	No	No	No

As nouns, myxovirus is a hypernym of orthomyxovirus; that is, myxovirus is a word with a broader meaning than orthomyxovirus:

orthomyxovirus: a group of viruses including those causing influenza
myxovirus: any of a group of RNA viruses including those that cause influenza and mumps

orthomyxovirus (noun)	myxovirus (noun)
a group of viruses including those causing influenza	any of a group of RNA viruses including those that cause influenza and mumps