substitute someone designated to succeed a (usually elected) person in office when the latter stops holding the office (through death, resignation or other reason)

Substitute original song written and composed by Willie Harry Wilson; first recorded by The Righteous Brothers

Substitute 2006 film by Vikash Dhorasoo

Substitute used to be an intern at a court or school, also a teacher's, professor's intern or assistant teacher at colleges.

Substitute single by Clout

English Phonetic Transcription

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British pronunciations are compiled from various sources (wiktionary etc.), including parts of speech.
American pronunciations are compiled from various sources (CMU pronunciation dictionary, wiktionary, etc.), including parts of speech.