Lexicon vs. Nomenclature — What's the Difference?

A lexicon is the vocabulary of a language or branch of knowledge (such as nautical or medical). In linguistics, a lexicon is a language's inventory of lexemes.

Nomenclature (UK: , US: ) is a system of names or terms, or the rules for forming these terms in a particular field of arts or sciences. The principles of naming vary from the relatively informal conventions of everyday speech to the internationally agreed principles, rules and recommendations that govern the formation and use of the specialist terms used in scientific and any other disciplines.Naming "things" is a part of general human communication using words and language: it is an aspect of everyday taxonomy as people distinguish the objects of their experience, together with their similarities and differences, which observers identify, name and classify.

A dictionary.

A system of names used in an art or science

A stock of terms used in a particular profession, subject, or style; a vocabulary

The system or procedure of assigning names to groups of organisms as part of a taxonomic classification

The vocabulary of an individual person

A set of rules used for forming the names or terms in a particular field of arts or sciences.

(Linguistics) The morphemes of a language considered as a group.

A set of names or terms.

The vocabulary of a language.

(obsolete) A name.

A dictionary that includes or focuses on lexemes.

A name.

A dictionary of Classical Greek, Hebrew, Latin, or Aramaic.

A vocabulary, dictionary, or glossary.

(programming) The lexicology of a programming language. (Usually called lexical structure.)

The technical names used in any particular branch of science or art, or by any school or individual; as, the nomenclature of botany or of chemistry; the nomenclature of Lavoisier and his associates.

(rare) Any dictionary.

A system of words used in a particular discipline;

The vocabulary used by or known to an individual. (Also called lexical knowledge.)

A set of vocabulary specific to a certain subject.

A list thereof.

A vocabulary, or book containing an alphabetical arrangement of the words in a language or of a considerable number of them, with the definition of each; a dictionary; especially, a dictionary of the Greek, Hebrew, or Latin language.

A language user's knowledge of words

A reference book containing an alphabetical list of words with information about them