Vulcans, which are a fictional extraterrestrial species from the Star Trek universe, have become a cultural icon. For those looking for synonyms to use when describing similar species, there are several possible options. For example, the word "extraterrestrial" itself can be used to describe beings from other worlds. Alternatively, the term "aliens" can be used to describe any beings from outside Earth. The term "ET" is also a common synonym that is widely recognizable in pop culture. Additionally, synonyms like "Martians," "Zetans," or "Xenomorphs" can be used to describe specific extraterrestrial species that are popular in various fictional universes.