Tear as a Noun:
* Concrete Noun: When "tear" refers to a drop of liquid from the eye, it's a concrete noun. You can see and feel a tear.
* Abstract Noun: When "tear" refers to the act of ripping something, it's an abstract noun. You can't see or touch the act itself, only the result.
Examples:
* Concrete: "A single tear rolled down her cheek." (referring to the liquid)
* Abstract: "The seamstress carefully avoided a tear in the delicate fabric." (referring to the act of ripping)
Let me know the sentence you're considering, and I can tell you definitively whether "tear" is being used as a concrete or abstract noun in that case!