the Verbs are module specific and depending on the installed product you have accessible verbs.
The full list of verbs usable for your product combination you'll get by querying (against SWIS v3)
SELECT Name, EntityName FROM Metadata.Verb
The verb arguments including their definitions, types etc. then by:
SELECT EntityName, VerbName, Position, Name, Type, XmlTemplate, XmlSchemas, IsOptional FROM Metadata.VerbArgument
Purpose of the verbs should be in most cases self-descriptive per their name.
I hope it helped at least a bit.
This is immensely helpful, thank you!
The verb arguments formatting is a little obscure at first, but I just need to compare that output versus one of the ones documented in the Tech Ref guide and then I'm sure it'll click.