I've spent some time analyzing Wordle (my starting words are SOARE and then BUILT, unless I've already got strong clues from SOARE).
If the answer has one E and you guess a word with two Es, only one of the Es will be marked correct (green/yellow). If one of the Es is in the correct place, it will be green and the other one grey. Otherwise the first E will be yellow and the second grey. So if the answer has fewer Es than your guess the game tells you.
If the answer has more Es than your guess there is no indication of this.
If the answer has one E and you guess a word with two Es, only one of the Es will be marked correct (green/yellow). If one of the Es is in the correct place, it will be green and the other one grey. Otherwise the first E will be yellow and the second grey. So if the answer has fewer Es than your guess the game tells you.
If the answer has more Es than your guess there is no indication of this.