Your two moon signs are opposite to each other forming an Opposition (180 deg).
This relationship may be extremely good, or it may lead to arguments over your own differences. You must watch for intolerance and lack of understanding, but overall these two signs are compatible. You are different in your understanding and opinion but your Moon signs indicate that you are are fairly well matched.
Cancer is typically a Moon sign of emotion and sensitivity, they have good intuition and a nurturing instinct. A Capricorn Moon is cheerful, optimistic, enthusiastic and restless for a new adventure. The Cancer Moon may have to keep the somewhat restless Capricorn Moon in a close relationship.