Scientific names consist of two or three names which MUST be used together, always in the same order, and always with only the first word capitalized.
The first word is the genus, a grouping of related species. A genus name cannot be shared except by related species. The genus name Furcifer can only be used for certain Malagasy chameleons. The genus Tylototriton can only be used for certain salamanders which currently occur only in Asia. Since plants, fungi, and animals use separate naming systems, it is currently possible for a name to be used both for a genus of plant, and a genus of animal [eg. Salvadora, Dracaena, Arizona - the last also being a bacterium]. Generally, a tiny difference in spelling is sufficient for two names to be considered different.
Subsequent names are first the species, and second [if assigned] the subspecies. A species is an interbreeding group of organisms with a shared gene pool; a subspecies is a subset of a species. There is no defining set of characteristics or definitions to distinguish "species" from "subspecies", so in current practice, subspecies are often eliminated as indistinct, or elevated to species status.
Genera are nouns. Species and subspecies are adjectives [often as what's called a 'noun in apposition' - a noun being used as an adjective for another noun]. Thus, Dracaena are caiman lizards, while Dracaena paraguayensis is the caiman lizard from Paraguay, while Dracaena guianensis is the caiman lizard from Guiana. It's not unusual for names the adjectives to be misleading or inaccurate, but once applied properly to a particular organism, they are permanent. The Sierra Nevada ensatina, for example, is Ensatina eschscholtzii platensis, being described from La Plata, Argentina. Of course, it's actually from the mountains of California only.
The same word can be used for two unrelated species, but for different reasons. Likewise, words or root words might be used for different reasons. The "bates" in poison frog names means 'walker', as in 'upon-the-ground-walker' [Epipedobates], but in Excidobates it's used so that you automatically think of it as a poison frog because of the shared root [compare Phyllobates, Dendrobates, Minyobates, Andinobates, Adelphobates]. The same usage might be repeated in unrelated organisms, such as 'dactylus' in certain frogs, various skinks, and a great many geckos.
Furcifer verrucosus and Tylototriton verrucosus have nothing to do with one another. They both have irregular, rough skin surfaces, and are thus 'verrucose'.
