Is MAINS a Wordle Word?

Yes. MAINS 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 MAINS mean?

/meɪnz/

Short for mainline.
To mainly play a specific character, or side, during a game.“He mains the same character as me in that game.”
Of a road: to convert into a main or primary road.

That which is chief or principal; the chief or main portion; the bulk, the greater part, gross.
A large cable or pipe providing utility service to an area or a building, such as a water main or electric main.
Short for main course.“I had scampi and chips for my main and a slice of cheesecake for dessert.”

4 more noun definitions

A hand or match in a game of dice.
The largest throw in a match at dice; in the game of hazard, a number from one to nine called out by a person before the dice are thrown.
A stake played for at dice.

2 more noun definitions

The domestic electrical power supply.“I plugged it into the mains and it blew up!”
The pipes of a centralized water supply that transport the water to individual buildings.
The main course of a meal.

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

Starter word rating: AverageIn the top 31% of all valid Wordle words for testing common letters.
Vowels: A, I
Unique letters: 5 of 5
Common letters: A, I

Hard-mode trap: 12 valid words fit the pattern _AINS. 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.