The acronym "WBT" stands for "web-based training," which refers to any form of online education or learning that takes place over the Internet. Synonyms for the term "WBT" might include phrases like "e-learning," "online instruction," or "digital education." These words all capture the idea that the learning is taking place through the use of digital technology, rather than in a traditional classroom setting. Other possible synonyms could include terms like "web-based coursework," "online tutorials," or "virtual lessons." Ultimately, the precise synonym used may depend on the specifics of the context in which the learning is happening, as well as the level of formality desired in the language used.