What are Three word with the root ity?

Correct — "ity" is not a root but a suffix. It is used to form nouns from adjectives, much like the suffix "ness." It often denotes a state, quality, or condition of something.

For example:

Sanctity (from sanctus → holy) = the state of being holy

Animosity (from animus → spirit, mind) = the quality of having hostility or strong dislike

Duplicity (from duplex → double) = the state of being deceitful or two-faced

So, "ity" helps transform adjectives or Latin roots into abstract nouns that describe a concept or condition.