sub

Abbreviation of submarine.

Clipping of submarine sandwich: a sandwich made on a long bun.

Clipping of submersible.

Clipping of substitute, often in sports or teaching.

Clipping of subscription (“a payment made for membership of a club, etc.”).

Clipping of subtitle

Clipping of subroutine (sometimes one that does not return a value, as distinguished from a function, which does)

Clipping of subeditor

Clipping of subcontractor

Clipping of subwoofer