Arrange the given words in alphabetical order and select the one that comes last :

Nomenclature, Normal, Nobble, Nostril, Nocent

Nomenclature, Normal, Nobble, Nostril, Nocent​​

First we compare 1st & 2nd letter: (N and O common in all word)

Now 3rd compare: (M. R,B, S and C)

B comes before C, C comes before N, N comes before R, R comes before S.

So, order is:

Nobble → Nocent → Nomenclature → Normal → Nostril

So, Nostril is last word.

Thus, the correct answer is (c).