Is the use of the term "is close" formal enough to deal with the similarity between two concepts?
"The term A is close to the concept of the term B".
I need to say that two concepts are very close, but without to use the term "similar" or "analogous" or "comparable".
I would do this because such terms sound more formal than I guess that will be good for an academic issue. I'm a beginner in English, maybe I'm wrong.