What rhymes with bother?

father

2 syllables:

father, strother

3 syllables:

church father

4 syllables:

city father, foster father, founding father, holy father

from: rhymezone.com

No perfect rhymes in my book, but maybe you should try near rhymes, substituting the "th" for a "v" e.g.

bovver hover windhover
Smother