Anchovy pizza and Pizza pie

Anchovy pizza noun - Tomato and cheese pizza with anchovies.

Pizza pie and anchovy pizza are semantically related. In some cases you can use "Pizza pie" instead a noun phrase "Anchovy pizza".

Pizza pie noun - Italian open pie made of thin bread dough spread with a spiced mixture of e.g. tomato sauce and cheese.

Anchovy pizza and pizza pie are semantically related. Sometimes you can replace phrase "Anchovy pizza" with "Pizza pie", this phrases are similar.