Final answer:
Alliteration is the language device used when you repeat the initial consonant sound of close or adjoining words. It is a literary device that involves the repetition of the same sound at the beginning of multiple words.
Step-by-step explanation:
Alliteration is the correct language device when you repeat the initial consonant sound of close or adjoining words. Alliteration is a literary device in which multiple words in a row start with the same sound, whether it is a vowel or consonant. For example, 'silly snakes slither silently' demonstrates alliteration with the repetition of the 's' sound.