9

2 possible definitions for '9'

9 as "denoting a quantity consisting of one more than eight and one less than ten"

Under this definition, 9 is an adjective and has the following properties:

nine, ix have the same meaning as '9'

cardinal is similar to 9.

Under this definition, 9 is a noun and has the following properties:

nine, IX, niner, Nina from Carolina, ennead have the same meaning as '9'

'9' can be a type of digit, figure.