Second class and Voicemail

Second class noun - Not the highest quality in a classification.

Voicemail and second class are semantically related. In some cases you can use "Voicemail" instead a noun phrase "Second class".

Voicemail noun - A computerized system for answering and routing telephone calls; telephone messages can be recorded and stored and relayed.

Second class and voicemail are semantically related. You can use "Second class" instead a noun "Voicemail".