say it: SUHB-stuh-toot
substitute is a noun, verb and adjective meaning "a person or thing that takes or can take the place of another". It carries 9 recorded senses.
a person or thing that takes or can take the place of another
an athlete who plays only when a starter on the team is replaced
someone who takes the place of another (as when things get dangerous or difficult)
“the star had a stand-in for dangerous scenes”
“we need extra employees for summer fill-ins”
put in the place of another; switch seemingly equivalent items
“the con artist replaced the original with a fake Rembrandt”
“substitute regular milk for fat-free milk”
“synonyms can be interchanged without a changing the context's meaning”
serving or used in place of another
“an alternative plan”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for substitute come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.