Original: Other types of storage organs (such as corms, rhizomes, and tubers) are sometimes erroneously referred to as bulbs. The correct term for plants that form underground storage organs, including bulbs as well as tubers and corms, is geophyte.
Simplified: Some plant storage organs that are similar to bulbs, but have different names are, tubers, corms (swollen stems), tuberous roots, and pseudobulbs.