OVERLAP

[noun]There needs to be an overlap of several centimetres between the roof tiles (= they need to cover each other by that amount), in order to keep the rain out. [C](figurative) Although the two books have very similar titles, there's actually no overlap between them (= they are about different subjects). [U](figurative) There are some overlaps between the products of the two companies (= they produce some of the same things). [C]