花 (はな) is a very common and simple word that is used to refer to a "flower" or "blossom" of any kind. For example, 桜の花 (さくらの はな) would mean "cherry blossom (blossom of a cherry tree)." The word can be used to refer to a flower store (花や) or a floral design, i.e. 花の模様 (はなの もよう). Pretty simple, but there you have it.