Yes, cancer is a Scrabble word!

Noun

1. Any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream

2. (astrology) a person who is born while the sun is in Cancer

3. A small zodiacal constellation in the northern hemisphere; between Leo and Gemini

4. The fourth sign of the zodiac; the sun is in this sign from about June 21 to July 22

5. Type genus of the family Cancridae