Go to the free Macmillan Dictionary. If the collocation appears in their short collocation box, it is to be verified. Macmillan’s free content is still drawn from their massive corpus.
One day, I was writing an essay on environmental issues and wanted to describe the "serious consequences" of climate change. I typed "serious" into the dictionary and found that it was often collocated with words like "consequences," "effects," and "implications." But what caught my attention was the suggestion to use "grave" instead of "serious." I had never thought of using "grave" in this context before, but it seemed to fit perfectly. macmillan collocations dictionary online verified
✅ opportunity noun ADJ. excellent, exciting, golden, great, ideal, unique | ample, considerable, plenty of | limited, little, not much | missed, lost | photographic, photo, picture VERB + OPPORTUNITY have, get | give sb, offer (sb), provide (sb with) | seize, take | miss, waste Go to the free Macmillan Dictionary