# [JavaScript (Node.js)], 29 bytes

<!-- language-all: lang-javascript -->

    s=>/\bill[^ayiou]/i.test(s+1)

[Try it online!][TIO-mndevfb9]

[JavaScript (Node.js)]: https://nodejs.org
[TIO-mndevfb9]: https://tio.run/##fc/PisIwEMfxu08xeNAWscUHcC@Kf1BPyl50F2Ka6kg6I5lE6NN3U5U97ELP@fCbb27qoUQ7vPsxcWGactrI9CM/ndHa47eqkcNXjpk34hMZTdJGMwlbk1m@JGXSX1tbKY@6n6aQ53BwwfT@kC1qQ2IK8AyRd8j4CjOuqkCo4yhThz1cTbsWu@Aztiok6dA7VTxeqn6rhbLynwVBDWuSO7oYfK7bE6FCetbAAOYug70JIkNoA5YOSV@7FjdIF@ASfNQr/P390zY/ "JavaScript (Node.js) – Try It Online"

Obvious