Bench warmer and Second-stringer

Bench warmer noun - (sports) a substitute who seldom plays.

Second-stringer and bench warmer are semantically related. In some cases you can use "Second-stringer" instead a noun phrase "Bench warmer".

Second-stringer noun - An athlete who plays only when a starter on the team is replaced.

Bench warmer and second-stringer are semantically related. Sometimes you can replace phrase "Bench warmer" with "Second-stringer", this phrases are similar.