Power saw and Reciprocating saw

Power saw noun - A power tool for cutting wood.

Reciprocating saw and power saw are semantically related. In some cases you can replace phrase "Reciprocating saw" with "Power saw", this phrases are similar.

Reciprocating saw noun - A portable power saw with a reciprocating blade; can be used with a variety of blades depending on the application and kind of cut; generally have a plate that rides on the surface that is being cut.

Power saw and reciprocating saw are semantically related. You can use "Power saw" instead a noun phrase "Reciprocating saw".