Since the line in the poem is not mention, and even the poem itself, here's a quick answer about the usage of metaphor and simile.
<span> In general sense, metaphor has a stronger assertion compared to simile . A metaphor implies that A "is" B ; a simile only says that A "is LIKE" B.</span>
A Onomatopoeia is a word that imitates the sound it represents. For example, cuckoo and<em> sizzle</em> are onomatopoeias.
"The longer the board, the more power one had"