Relatedly is a transitional word that is often used to connect two or more ideas that are logically or thematically linked. There are a number of other synonyms for this word that can be used to vary your writing style and to add variety to your sentence structure. Some synonyms that you might consider using include "in connection with," "concerning," "pertaining to," "relative to," and "about." These words can be used in a variety of contexts to convey a sense of relationship or connection between different ideas, and can help to create a more cohesive and readable piece of writing.