With only one letter different and both words having a negative aspect, adverse and averse are easily conufsed if you aren’t careful.
adverse: not in your best interests, unfavourable
She had an adverse reaction to the new medicine.
averse: strongly against or opposed; turn away
He is averse to opening a new branch in Sydney.
verse: text with metre and rythym, such as in poetry or a section of a song
The second verse is my favourite part of the song.