noun
minor difference
Often used in the phrase 大同小異 (largely the same with only minor differences). As a standalone noun, it is somewhat formal and less common in casual speech.
両者の意見には小異があるが、基本的には同じだ。
There are minor differences between their opinions, but they are basically the same.
この二つの製品は小異を除けばほとんど同じだ。
These two products are almost the same except for minor differences.