\def\IgnoredWords {a,is,to,of,or,and} \define[1]\CapitalizeWithIgnoreWord {\doifinsetelse{#1}\IgnoredWords{#1}{\Words{#1}}} \def\CapitalizeWithIgnore {\applytosplitstringwordspaced\CapitalizeWithIgnoreWord} \starttext \CapitalizeWithIgnore{Is this is some of my input or another and to the end?} \stoptext