alliteration is multiple Assonance is words starting with the same sound
assonance is Assonance is a resemblance in the sounds of words or syllables either between their vowels or between their consonants. such as penitence
onomatopoeia is when words sound like the thing that they mean, such as boom, ding, or beep, so crash would fall under onomatopoeia, as a wave crashing kind of sounds like someone saying CRASH