6

2 possible definitions for '6'

6 as "the cardinal number that is the sum of five and one"

Under this definition, 6 is a noun and has the following properties:

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

Under this definition, 6 is an adjective and has the following properties:

vi, six, half dozen, half-dozen have the same meaning as '6'

cardinal is similar to 6.