They are all derived from English transliterations, and then add a prefix of grass to indicate aromatic hydrocarbons. Hydrocarbons that were later discovered to have no aromatic taste also use this name. For example, benzene, xylene, naphthalene, etc. . Benzene, Naphthene, Anthracene, Phenanthrene. Before the 20th century, organic substances lacked some systematic nomenclature, and they were usually named by the inventors in papers. After all, there is no concept of benzene ring. How to name it systematically? Of course, people usually have etymological basis when naming. Benzene was prepared by Michellich from benzoic acid (also called benzoic acid), which was obtained from benzoin resin. Benzoin was originally a spice in the 15th century. The Arabs called it "Luban Jawi" (spice from Java), and then it became benzoin in Europe. Then you need to know that most parts of Europe pronounce z as ts, and Romance and Greek both distinguish aspirated sounds, so in theory they are pronounced somewhat similar. The English word for naphthalene is taken from "naphtha", which is Naft that came from Persia in the ancient Greek era, and generally refers to petroleum. The English word anthracene comes from hard coal (anthracite), which in turn comes from the Greek word for "coal" (?νθρακα?, ánthrakas). Phenanthrene is actually synthesized from phenyl- (phenyl) and anthracene (anthracene). Frenchman Auguste Laurent also synthesized benzene three years after Michellich synthesized benzene. He named it phène, which was later used as the root of "phenyl". The word phène comes from the Greek word Phaino, which means sparkling, mainly describing its burning. Although there is a lot to add, I will wait until someone asks before opening a new answer. It has nothing to do with vanilla. It is named according to the naming rules of organic substances, similar to using stone for non-metals and gold for metals.