In a language like German or English where so many words have just a prefix difference, it would be really helpful to find out the meanings of our attempts. Say if I say vergleich instead of gleichzeit. If the app we're to say, no, you said comparison. That way, the user learns at twice the speed.
And what shall it say about "Gleichzeit"?
Never ever heard that word :-)
We have a word called "Gleitzeit" which means something very different (to work not fixed but to vary starting time and end).
However I do agree, that the system could offer a lookup translation icon to show you, what meaning your entered word has, if it was successfully matched and there was no typo.