There are several synonyms that can be used in place of the phrase "hand in glove with". Some of these include closely associated with, intimately linked with, tied to, inextricably linked to, and mutually dependent on. Other synonyms to consider are in partnership with, in collaboration with, in tandem with, in league with, and in cahoots with. Each of these phrases expresses a similar idea of close cooperation and coordination between individuals or groups. Using these synonyms can help to add variety and nuance to your writing, and make it more engaging for your readers.