documentclass{article}

usepackage{polyglossia}
setmainlanguage{english}

begin{hyphenrules}{english}
hyphenation{de-ri-va-tio-nal}
hyphenation{non-de-ri-va-tio-nal}
end{hyphenrules}

begin{document}

parbox{0pt}{hspace{0pt}non-derivational}

end{document}