Lamellas are thin and flat strips of material that can be found in various applications and products. If you are searching for synonyms for this word in order to vary your vocabulary, there are a few options you could consider. For instance, you could use the term "slats" as a substitute, which may be more common in the realm of construction and interior design. Another option could be the phrase "blade-like strips" or simply "thin strips." Finally, "shutters" or "venetian blinds" are two more specific alternatives that could be used depending on the context.