Subdialect is a term used in linguistics to describe regional variations of a language within a larger dialect. Some potential synonyms for subdialect include idiolect, topolect, and lect. An idiolect refers to the individual language or speech patterns of a particular person, rather than the broader linguistic community they belong to. A topolect, on the other hand, is a term that describes a specific speech variety within a geographic region or community. Similarly, a lect is a variety of language spoken within a particular region or community. While these terms are related, they all focus on slightly different aspects of linguistic variation.