GLTD, which stands for global top-level domain, is a term commonly used in the context of website and domain name registration. While there are not many direct synonyms for this particular phrase, there are several related terms that can be used to convey a similar meaning. These include domain extension, website suffix, internet domain, and web address ending. Additionally, specific global top-level domains can be referred to by their individual names, such as .com, .org, .net, and .edu. Understanding the different terms associated with website and domain name registration is important for businesses and individuals looking to create a strong online presence.