is there a word that ends inj

Yes—there are words that end in “inj,” but they’re extremely niche and essentially only show up in word-game dictionaries and similar lists, not in normal everyday English.
In standard English usage (books, articles, speech), you will basically never see a real, commonly used word ending in “inj.” The sets of words ending in “j” at all are already tiny (things like “haj,” “raj,” “hadj”), and “‑inj” is even rarer. Modern word-finder and Scrabble-style tools list entries that technically “end in inj,” but they are effectively just artifacts of those databases rather than meaningful vocabulary you’d use.
So, if your question is:
- “Is there any playable or listed string in word-finder tools that ends in ‘inj’?” → Yes, those tools say there are.
- “Is there a normal English word, like ‘orange’ or ‘injury,’ that ends in ‘inj’ and has a real definition?” → Practically speaking, no.
If you’re working on a puzzle or a game, it’s usually safe to treat “no common English word ends in ‘inj’” as the intended idea.