Alliteration is the repetition of initial consonant sounds in neighbouring words with emphasis on the first letters.
Good men are gruff and grumpy, cranky, crabbed, and cross.
A moist young moon hung above the mist of a neighboring meadow
Assonance is the repetition of similar vowel sounds in neighbouring words.
Try to light the fire
It beats . . . as it sweeps . . . as it cleans
The spider skins lie on their sides