seduces
Leather
Cheetah
Copters
therein
bellhop
The seven-letter word that contains 10 different words without rearranging any letters is "therein." The words that can be formed using the letters of "therein" are: the, there, herein, herein, here, there, ere, rein, in, and he.
bellhop
therein
therein
bellhop
A fifteen letter word that contains the letters atragiclostnoun is congratulations!!!
One word that fits your criteria is "distant." It starts with the letter 'd,' ends with 't,' and contains seven letters.