Is STEMS a Wordle Word?

Yes. STEMS is a valid Wordle word.

It is not on the Wordle answer list, so it is unlikely to be a daily answer.

Plurals ending in S are almost never chosen as Wordle answers.

What does STEMS mean?

An electron microscope that transmits a very narrow beam of electrons through a sample; it can detect individual large or heavy atoms.

14 more noun definitions

The above-ground stalk (technically axis) of a vascular plant, and certain anatomically similar, below-ground organs such as rhizomes, bulbs, tubers, and corms.
A slender supporting member of an individual part of a plant such as a flower or a leaf; also, by analogy, the shaft of a feather.“the stem of an apple or a cherry”
A narrow part on certain man-made objects, such as a wine glass, a tobacco pipe, a spoon.
The main part of an uninflected word to which affixes may be added to form inflections of the word. A stem often has a more fundamental root. Systematic conjugations and declensions derive from their stems.
A person's leg.
The penis.
A vertical stroke of a letter.
A vertical stroke marking the length of a note in written music.
A premixed portion of a track for use in audio mastering and remixing.
The vertical or nearly vertical forward extension of the keel, to which the forward ends of the planks or strakes are attached.
A component on a bicycle that connects the handlebars to the bicycle fork
A part of an anatomic structure considered without its possible branches or ramifications.
A crack pipe; or the long, hollow portion of a similar pipe (i.e. meth pipe) resembling a crack pipe.
(chiefly British) A winder on a clock, watch, or similar mechanism

To remove the stem from.“to stem cherries; to stem tobacco leaves”
To be caused or derived; to originate.“The current crisis stems from the short-sighted politics of the previous government.”
To descend in a family line.

3 more verb definitions

To stop, hinder (for instance, a river or blood).“to stem a tide”
To move the feet apart and point the tips of the skis inward in order to slow down the speed or to facilitate a turn.

Definition from Wiktionary, available under the CC BY-SA license.

Starter word rating: WeakIn the top 58% of all valid Wordle words for testing common letters.
Vowels: E
Unique letters: 4 of 5Repeats S
Common letters: T, E

Hard-mode trap: 7 valid words fit the pattern STE_S. If you reach it, you may need several guesses to find the last letter.

Letter ratings use how often each letter appears in Wordle answers.

Tap its tiles to the colours Wordle showed, and the Wordle Solver lists every word that still fits, with the best next guess.