Johnsons rhymes with:
johnsen's, johnson's, johnsen's, johnson's, wisconsin's, aaronson's, ahmanson's, ahmansons, atkinson's, benson's, goldenson's, hansen's, hanson's, janssens, johnsen's, johnson's, levinson's, manson's, parkinson's, robinson's, robinsons, robinsons', swensen's, wilkinson's, wisconsin's
Johnsons sounds like:
jamaicans, janssens, jenkens, jenkins, jingsheng, jinkins, johnsen's, johnson's, junghans, junking, junkins