relative vs relativity

relative and relativity both are nouns.

Word	Noun	Adjective	Verb	Adverb
relative	Yes	Yes	No	No
relativity	Yes	No	No	No

relative (noun)	relativity (noun)
an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus)	the quality of being relative and having significance only in relation to something else
a person related by blood or marriage	(physics) the theory that space and time are relative concepts rather than absolute concepts

relative (adjective)	relativity (adjective)
estimated by comparison; not absolute or complete
properly related in size or degree or other measurable characteristics; usually followed by `to'