When expressing the idea of something being subordinate to another thing, there are a number of different synonyms that can be used to convey this meaning. For example, one might say that something is subject to another, meaning that it is controlled or influenced by it. Alternatively, one might use the word subservient to describe something that is of a lower or secondary rank or function in relation to another thing. Another option might be to use the phrase inferior to, which suggests that the thing being described is of a lower quality or importance than the thing it is subordinate to.