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Just three words carry M second and Y third, and none of them belongs to everyday English.
AMYLS comes from chemistry, where an amyl group is a short carbon chain. EMYDE and EMYDS refer to freshwater turtles, and the two spellings cover the same animal.
EMYDE and EMYDS are variants of emyd, so the page really holds two distinct words rather than three. That is worth knowing, because confirming the first four letters still leaves a choice that carries no meaning.
A short chain of carbon atoms attached to a larger molecule. Amyl alcohol and amyl nitrite are the compounds most people have heard of.
A freshwater turtle or terrapin. The word is rare even in zoology, where the family names are used instead.
AMYLS, since it is the only one that is not part of a variant pair. If it is wrong, the answer is one of the two turtle spellings.
M followed by Y needs a vowel in front and two letters behind, and English almost never builds words that way. The pair is far commoner at the end, as in ARMY and ENEMY.
Zero of the three carry one. Technical words this short rarely leave room for a repeated letter.