Relationship
Relation
noun
The kanji and the word are exactly the same. That means they share meanings as well.
The reading is the kun'yomi reading since it's a single kanji, all alone, but this is the reading you learned with the kanji, so you should be okay and have a great relationship with this word going forward.
仲がいい
on good terms
仲がよい
on good terms
仲がわるい
on bad terms
母とは、あんまり仲が良くないんだよね。
I don't get along with my mother very much.
あのカップル、本当に仲が良いよね。
That couple has a really good relationship.
あの旅行でチームメンバーとの仲が深まった気がするよ。
I feel like my relationship with my team members deepened on that trip.