paramyxovirus vs myxovirus

paramyxovirus and myxovirus both are nouns.

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

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

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

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