To many scholars he is still the sublime English poet. To the rest of us, he's the blind bloke who wrote the scarily long and difficult epic about heaven, hell and the failure of the English revolution we were made to read at school. But John Milton, whose 400th birthday is celebrated this year, deserves to be remembered for rather more than Paradise Lost. Step aside Martin Amis, Will Self et al; Milton is in a league of his own for neologisms.

According to Gavin Alexander, lecturer in English at Cambridge university and fellow of Milton's alma mater, Christ's College, who has trawled the Oxford English Dictionary (OED) for evidence, Milton is responsible for introducing some 630 words to the English language, making him the country's greatest neologist, ahead of Ben Jonson with 558, John Donne with 342 and Shakespeare with 229. Without the great poet there would be no liturgical, debauchery, besottedly, unhealthily, padlock, dismissive, terrific, embellishing, fragrance, didactic or love-lorn. And certainly no complacency.

"The OED does tend to privilege famous writers with first usage," Alexander admits, "and early-modern English - a composite of Germanic and Romance languages - was ripe for innovation. If you couldn't think of a word, you could just make one up, ideally based on a term from French or Latin that others educated in those languages would understand. Yet, by any standards, Milton was an extraordinary linguist and his freedom with language can be related to his advocacy of personal, political and religious freedoms."

Milton's coinages can be loosely divided into five categories. A new meaning for an existing word - he was the first to use space to mean "outer space"; a new form of an existing word, by making a noun from a verb or a verb from an adjective, such as stunning and literalism; negative forms, such as unprincipled, unaccountable and irresponsible - he was especially fond of these, with 135 entries beginning with un-; new compounds, such as arch-fiend and self-delusion; and completely new words, such as pandemonium and sensuous.

Not that Milton got things all his own way. Some of his words, such as intervolve (to wind within each other) and opiniastrous (opinionated), never quite made it into regular usage - which feels like our loss rather than his.