sub·sti·tute.

How do you pronounce substitutable?

Break 'substitutable' down into sounds: [SUB] + [STI] + [TYOO] + [TUH] + [BUHL] - say it out loud and exaggerate the sounds until you can consistently produce them.

What do you call a substitute person?

someone who takes the place of another (as when things get dangerous or difficult) synonyms: backup, backup man, fill-in, relief, reliever, stand-in. types: locum, locum tenens. someone (physician or clergyman) who substitutes temporarily for another member of the same profession. double, stunt man, stunt woman.