Alliteration

• The sun sizzled the swimmers' skin.
• The wild wind whistled and wailed.
• The rapidly rising river rushed rampantly.
• Little Leaping lizards lay lazily on a log.

Onomatopoeia

• The locomotive chugged down the rickety track.
• The arrow whistled in the still air.
• The soldiers snapped to attention.
• His voice droned on monotonously.