four; 4; four years of age; ten o'clock (in the old time system); burakumin; cross grips
4th day of the month; four days
14th day of the month; 14 days
24th day of the month; 24 days
fundamental interactions; four fundamental forces of nature
the Four Freedoms (as defined by Franklin D. Roosevelt: freedom of speech, freedom of worship, freedom from want, freedom from fear)