When trying to find another word or phrase that can mean "substitutes for," there are many options to choose from. Some examples include "alternatives," "replacements," "stand-ins," "surrogates," "proxies," "supplies," and "spares." Each of these words implies that there is something that can take the place of something else, whether it be a person, thing, or idea. Using synonyms for "substitutes for" is great for varying your writing style and avoiding repetitive language. By experimenting with different expressions and words, you can add depth and complexity to your writing while conveying the same message.