「花 (はな)」 means "flower." You use this word to talk about the beautiful, colorful, and often fragrant part of a plant. For example, you might see many flowers in a park or receive them as a gift. It’s a common noun.

植物(しょくぶつ)の美(うつく)しい部分(ぶぶん)です。公園(こうえん)で色(いろ)々(いろ)な花(はな)を見(み)ます。