Idioms are lexical items, which means they are stored as catenae in the lexicon. The term "MacGyver" has now become part of the colloquial American English lexicon. Many terms that originated as gay slang have become part of the popular lexicon. The differences extend to spelling, lexicon, and grammar. Creoles are classified with the language that supplied their basic lexicon. Tolkien developed a list of names and meanings called the "Qenya Lexicon". They differ only slightly in lexicon and phonology. He continues, "it's introduced a new phrase into the pop cultural lexicon". It contains complete Roman transliteration, explication and an extensive lexicon. The phrase "the Woodstock generation" became part of the common lexicon. Marshall's wit is best remembered for a phrase he introduced to the American lexicon. Merriam-Webster dated the word's appearance in the American English lexicon at 1951. Parts of the lexicon can be organized using word-bushes. The proposed Thracian words in the Ancient Greek lexicon are not numerous. Conversely, Dutch contributed many loanwords to English, accounting for 1.3% of its lexicon.