Answer:
Earnings per share is defined as the net earnings/ profit of a company divided by the number of common stock outstanding. It therefore shows just how much the company made per individual share.
Funds from Operations (FFO) on the other hand refer to cashflow from operations of Real Estate Investment Trusts (REITs). REITS use this as their EPS and so it is sometimes quoted per-share.
Adjusted Funds From Operations (AFFO) are calculated in similar fashion to FFOs and used by REITS as well. This one adjusts the FFO for costs incurred which means it is more accurate and so preferred over FFO.
Dividend per share is the amount of dividend that has been paid to each share within a period. This definition means that even interim dividends are included in the calculation which is done by dividing the total dividends over a period by the number of outstanding shares a company has.