It's irrelevant: humanoid is a type of creature (see the first chapter of the Monster Manual). Undead and constructs are different types and are ineligible targets. As are giants, dragons, etc.

What is considered humanoid 5e?

Humanoids are the main peoples of a fantasy gaming world, both civilized and savage, including humans and a tremendous variety of other species. They have language and culture, few if any innate magical abilities (though most humanoids can learn spellcasting), and a bipedal form.

Are zombies humanoid 5e?

Most zombies are made from humanoid remains, though the flesh and bones of any formerly living creature can be imbued with a semblance of life. ... Once turned into a zombie, a creature can't be restored to life except by powerful magic, such as a resurrection spell.