I'm sure not everyone here knows what alliterates are (myself included) so here's the definition:
al‧lit‧er‧a‧tion  [uh-lit-uh-rey-shuhn] Pronunciation Key - Show IPA Pronunciation
–noun
1. the commencement of two or more stressed syllables of a word group either with the same consonant sound or sound group (consonantal alliteration), as in from stem to stern, or with a vowel sound that may differ from syllable to syllable (vocalic alliteration), as in each to all. Compare consonance (def. 4a).
2. the commencement of two or more words of a word group with the same letter, as in apt alliteration's artful aid.
but fuck that, I'll do the rhyme shit:
Thickness