Dreamt - dreamed
The difference between dreamt and dreamed as the past tense of the verb 'to dream' is that they sound different. Both forms mean exactly the same - but the first is pronounced with the same vowel as in ten, IPA: /drɛmpt/, while the second rhymes with seemed, IPA: /driːmd/. The choice between them is one of taste - largely phonetic taste. (Note that in the former, native speakers usually sound the '-p-' very clearly.)
- See also Dream (irregular verb).