First we will arrange the letters of the word $\text{LEADING}$ in the alphabetical order.

$\text{A, D, E, G, I, L, N}$

Number of words staring with letter $A=6!=720$

Number of words staring with letter $\text{D}=6!=720$

Number of words staring with letter $\text{E}=6!=720$

Total words are $720+720+720=2160>2017$.

Hence, the required word will start from the letter $\text{E}$ and before $\text{E}$ we have total $720+720=1440$ words.

Now,

Number of words staring with letters $\text{EA}=5!=120$

Number of words staring with letters $\text{ED}=5!=120$

Number of words staring with letters $\text{EG}=5!=120$

Number of words staring with letters $\text{EI}=5!=120$

Total words$=\left(1440\right)+120+120+120+120=1920$

Number of words staring with letters $\text{EL}=5!=120$

Total words

$=\left(1920\right)+120=2040>2017$

Hence, the required word will start from letters $\text{EL}$. And, words before $\text{EL}$ are $1920$.

Now,

Number of words staring with letters $\text{ELA}=4!=24$

Number of words staring with letters $\text{ELD}=4!=24$

Number of words staring with letters $\text{ELG}=4!=24$

Total words

$=\left(1920\right)+24+24+24=1992$

Now, 

Number of words staring with letters $\text{ELI}=4!=24$

Now, total words$=\left(1992\right)+24=2016$

Number of words staring with letters $\text{ELN}=4!=24$

Total words $=2016+24>2017$

Hence, required word is $\text{ELNADGI}$.