Googling produced the following:
Aha!!! VAUNTAGE is a word. I don't care if it's archaic.Dr.Goodword wrote: Meaning: To brag about or boast of pretentiously; to bluster about, to tout flamboyantly.
Notes: The Oxford English Dictionary now lists such gems as vauntful and vauntage as archaic, apparently, because no one uses them any more. I think we should. The only current derivatives are vaunter and vaunting, as to be annoyed by the vaunting of the vaunting young woman. Wouldn't you much prefer to be annoyed by the vauntage of the vauntful young woman? (These words are driving my spell-checker crazy but I love them.)
More extremely useful words can be found in the alphadictionary.com goodword dictionary