Is INKER a Wordle Word?

Yes. INKER is a valid Wordle word.

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

What does INKER mean?

/ˈɪŋ.kə(ɹ)/

A person or device that applies ink.
In comic book production, a person who outlines and otherwise embellishes the artwork of a penciler in preparation for publishing.
A tattoo artist.

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

Starter word rating: AverageIn the top 16% of all valid Wordle words for testing common letters.
Vowels: I, E
Unique letters: 5 of 5
Common letters: I, E, R

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.