I'm going to stick my neck out and say that the rarely hyphenated “will call”(sometimes capitalized as “Will Call”) is used as a noun nowadays more often than as a defining descriptor.

What is a sentence for will call?

Listen, if it will make you feel better, Mama will call him tomorrow to make sure all is well.

What is a will call sale?

1 : a retail sale in which something is reserved by a deposit with full payment to be made when the merchandise is called for at a later date.