But if you have a couple of fine Vuillard paintings why not show them off? Taglialatella Galleries showed these two; Le Cote De Honfleurs dates to the 1903-4 while Le Faisen is slightly earlier, between 1892 and 1895.
You will sometimes hear his work called "impressionist." That may be correct if you us a small "i" but as an answer on an art history exam it might well be incorrect! Vuillard's work comes from a group who worked around the same time (slightly later) as the Impressionist painters--the Nabis.
But really all this is splitting hairs. It is interesting that similar groups had different labels hung on them--at the time even. Was Vuillard any more experimental than Paul Gauguin? And one painter is a Nabi (based on his associates) while another is simple a Post Impressionist (all Nabis are Post Impressionists but not visa-versa) And let's not even get into who is a POST IMPRESSIONIST versus and IMPRESSIONIST because that really makes the head start to throb.
Most of the terminology comes from critics and were used as conveniences in much the same way rock n roll aficionados refer to one type of music as Death Metal and another as Thrash Metal while the uninitiated listen and are unable to discern a clear difference.
Suffice it to say that if you are a fan of any of the Impressionists you may find Nabis painters of interest. All the details as to who was what sort of painter is the sort of minutiae that drives regular people away from art. They don't want some snot telling them in a huff; "He was not an IMPRESSIONIST but ra-ther a POST IMPRESSIONIST."
This is not to say there are no differences--subtle or otherwise. Ultimately, unless you are in an Art History class or working at a museum or gallery? These details are just minor matters of interest (or not).