Each month we offer an example of a new feature of the OED Online in action—the Historical Thesaurus of the OED, which provides a fascinating insight into how English has been used in the past. The Historical Thesaurus charts the development of English over 1000 years. With it you can discover synonyms for individual words in the OED (and then trace their development over time), and chart the linguistic progress of a chosen object, concept or emotion, with links to the OED definition of each new word. April’s word cloud is made up of historical synonyms for drunk—from ‘fordrunken’ (c.897) to ‘tired and emotional’ (1981)—offering insights into the many, many ways of being intoxicated. This month’s cloud offers links to selected words from a Thesaurus list, but with subscriber access to the OED Online you can click on the full list (extract shown here) to go to the relevant page of the Thesaurus. For more tips on use, see our guides to the Historical Thesaurus.