You´re right! Release is the word I was looking for.
As for the pairs of words or individual words like:
Good night, had not, hadn´t, eaten, rednote
I have read that the former consonant (t,d) is released as the nasal explosion (the soft palate is lowered) so that the tip of the tongue rests on the alveolar ridge all the time during the articulation of the sequence t (d) + n. In that case the same applies to the inderlined part in "a long handled knife" (as also the latteral explosion is present here).
But is it also standard to pronounce them separately - t (d) aspirated + n? I have read that it is not but I ask because for me it is quite demanding and if I´m not not aware of it the best I can think of is that I form t (d) with the soft palate raised to obstruct the air flow and when I should release it through the nose all I do is just articulate "n" when the soft palate is lowered. I think this is not the correct pronunciation either, or is it?
I think there are also examples where no nasal explsion is present like "London" is it right?
What about k + n is the nasal explosion present here as well? I find it even more difficult to pronounce and would rather aspirate the former consonant. I have also heard that in some words such as "bacon" I can even pronounce the sylabic velar variant of "n". What do you think?
Thank you very much!