The term "more umbilicate" refers to a specific type of surface texture that is characterized by a central depression or indentation, similar to the shape of an umbilical cord. If you're looking for synonyms for this term, there are several options to consider. You might describe a surface as being more sunken, recessed, or depressed than another, or use words like concave or hollow to suggest a similar shape. Alternatively, you could use adjectives like indented, dented, or impressed to describe the specific nature of the surface texture. Whatever terms you choose, remember that effective communication often relies on choosing the most precise and evocative words available - so choose wisely!