Definitions of null
The word null uses 4 letters:llnu.
NULL is playable in:
a. - Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless. 2
n. - Something that has no force or meaning. 2
n. - That which has no value; a cipher; zero. 2
v. t. - To annul. 2
n. - One of the beads in nulled work. 2