There are several synonyms for the phrase "is one of." Some options include "belongs to," "is a part of," "forms a component of," "occupies a position in," and "is included in." These phrases can help to vary your language and avoid repetition when discussing a group or category of items. Additionally, using synonyms for "is one of" can add clarity and specificity to your writing or speech by pinpointing the exact relationship between the item in question and its group. So next time you want to say "is one of," consider one of these synonyms to elevate your language.