Question: Does anyone know if there is an English collocations dictionary?
Answer: Yes. Visit this link >>> collocations dictionary <<<. This link leads you to an online English dictionary of collocations. You can search for collocations online.
Question: Do you know any good online dictionary of collocations?
Answer: Yes. Welcome to English collocations dictionary online. The dictionary can help you to make a good choice of using words. The link above also shows you how to use the collocations dictionary.