Microgroove is a term used to describe the very fine grooves found on vinyl records. For those who are looking for synonyms for this word, there are a few options. One possibility is "microscopic groove," which emphasizes the small size of the grooves. "Narrow groove" is another option, as it highlights the thinness of the grooves. "Fine groove" and "miniature groove" are additional possibilities that convey the same meaning. Ultimately, the exact synonym you choose may depend on the context in which you are using the word and the tone you want to convey.