Doubts in site wide messages

I'd appreciate it if someone could clarify the following:

Do "Sent", "Dismissed" and "Removed" refer to a single message or to several messages (i.e. to all sent/dismissed/removed messages), in

Is "List" a noun or a verb, in:

swm-page-title-list ("[[:MediaWiki:Swm-page-title-list/en]]") (being a page name, one assumes it´s a noun here, but still)
swm-label-list ("[[:MediaWiki:Swm-label-list/en]]")

swm-label-dismissed is only used as page title after a message is sent out.
swm-label-sent and swm-label-dismissed: same like above, single message.
swm-list-table-removed is a column heading of a table with one message per line. The column contains either yes or no if the message was removed or not.
swm-page-title-list is used as noun.
swm-label-list also is used as noun.

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