No. A simile compares one thing to another. Therefore no one word by itself can be a simile and so the word "as" is not a simile. However the word "as" often forms part of a simile, for example: "he is as brave as a lion".
A simile is a type of figurative language.
a simile foe wondrous
As dunb is not a word in English there is no simile for it.
what is a simile for benifits
Like word is mostly used for identifying a simile. It is a word that is used for comparison.
A metaphor
it can be sometimes. for example, 'she was a brave as a lion'. a lion is a noun. but it also doesn't have to be. for example, 'she was like a dream'. a dream isn't real.
The sentence 'Stubborn as a mule' is a simile as it contains the word 'as' which makes it a comparison.
Here's three antonyms for the word "simile"; difference, dissimilarity, unlikeness
sin
metaphor