"Grugru" is a unique word that has different meanings, depending on how it is used. It can refer to the very hard seeds found inside the fruit of certain palm trees or to a type of long, thin, black hair often worn in dreadlocks. However, if you're looking for synonyms for "grugru", there are a few options. For the seed, you could use "palm nut" or "corozo." If you're referring to the hair, you could use "dreadlocks," "locs," or "rasta hair." Regardless of which meaning you're referring to, each of these synonyms share a connection to the unique and diverse cultures that use the term "grugru".