Substitute means to use something instead of the originally needed item or to have a person do something for another.
Something that forces an opening or a beginning:
An actor who learns the part of another actor so as to serve as a substitute when necessary
Something that is standard, well-tested, or frequently used.
Foreign or allied armed forces aiding those of a country at war
A combat aircraft designed to carry and drop bombs.
A person or thing that takes the place of another, esp. of one that has worn out, broken down, etc.
An accumulation because of a stoppage
Find another word for subs. In this page you can discover 18 synonyms, antonyms, idiomatic expressions, and related words for subs, like: substitutes, supplies, wedges, torpedoes, submarines, hoagies, heroes, grinders, understudies, standbys and seconds.