Margin call is a warning that StopOut may soon take place. It’s also a broker’s demand for a client to deposit additional funds to maintain a client’s adverse position. In the terminal: the information in the Trading tab on the account (balance, funds, margin, etc.)

All MT5 accounts have Margin call at 100%.

Stop Out is an order for a compulsory closing of positions, generated by the server due to lack of funds. In the terminal: positions are closed, and it can be seen in the account history.