Second-string and Thumbnail

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

Thumbnail and second-string are semantically related. In some cases you can use "Thumbnail" instead an adjective phrase "Second-string".

Thumbnail adjective - Marked by the use of few words to convey much information or meaning.

Second-string and thumbnail are semantically related. Sometimes you can use "Second-string" instead an adjective "Thumbnail".