severalty vs ownership

severalty and ownership both are nouns.

Word	Noun	Adjective	Verb	Adverb
severalty	Yes	No	No	No
ownership	Yes	No	No	No

As nouns, ownership is a hypernym of severalty; that is, ownership is a word with a broader meaning than severalty:

severalty: exclusive individual ownership
ownership: the relation of an owner to the thing possessed; possession with the right to transfer possession to others

severalty (noun)	ownership (noun)
exclusive individual ownership	the act of having and controlling property
the state of being several and distinct	the relation of an owner to the thing possessed; possession with the right to transfer possession to others
	the state or fact of being an owner