Gofer and Second string

Gofer noun - An employee whose duties include running errands.

Second string and gofer are semantically related. In some cases you can use "Second string" instead a noun "Gofer".

Second string noun - A squad of players that are available either individually or as a team to relieve or replace the players who started the game.

Gofer and second string are semantically related. Sometimes you can use "Gofer" instead a noun phrase "Second string".