Question 10: Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions: Without speaking other word, I stared at the ridges of sand in the moonlight.
other + uncountable noun/ plural noun: (people or things) other another + singular noun: another
Here the noun “word” is a countable noun in the singular form => use “another”.
Edit: other => another
Without saying another word, I stared at the sands in the moonlight.