Benchwarmers and Second-string

Second-string and benchwarmers are semantically related In some cases you can use "Second-string" instead a noun "Benchwarmers".

Second-string adjective - Being a replacement or substitute for a regular member of a team.

Benchwarmers and second-string are semantically related in group of substitute players topic. Sometimes you can use "Benchwarmers" instead a noun phrase "Second-string".