The word for ‘enemy’ is ‘eyvah, which has a gematria of 18 (3×6). The same is true of the Hebrew word for ‘sin’ – chatta’, which also has a gematria of 18. When YHVH blew into Adam’s nostrils and he became a ‘living’ soul, the word used here for man’s life is chay, which again has a gematria of 18.
The 6th letter of the Hebrew Aleph-Bet is vav. This word means a hook or a nail. There are only two Hebrew words that begin with a vav, but this letter appears the most times in scripture. It is not just coincidence that the other Hebrew word is vazar, which means to be guilty, or to bear a burden. It is only used one time in scripture.