I find it odd that there are so many different names for what is essentially the same instrument. The little Martin tenor guitar that Nick Reynolds played and the huge Manzer Pikasso guitar that Pat Methany plays and the strat that Eric Clapton plays are all called guitars, yet an octave mandolin that is two inches shorter than a bouzouki gets a different name. Add a course and it becomes a cittern. Change the body shape and it becomes a bouzar. My OM has more in common with my friend's (Irish)bouzouki than his bouzouki has in common with another friend's 3 course (Greek) bouzouki.
Gerald Trimble used to use the words interchangeably. Grit Lasken called his "long necked mandolins" regardless of the neck length or number of strings. Donal Lunney (sp?) had a large bodied bouzouki that he called a "Blarge". I've heard other players call them "mando-things". I've been told,"I want you to play your monster mandolin on this." I once put octave strings on my G and 3rd D courses and someone accused me of turning my OM into a bouzouki. I tune my OM GDAD, and have been told that was bouzouki tuning. I've even heard them called mandolas or octave mandolas, even though a mandola already exists that is the mando equivalent of the viola, tuned CGDA. An octave mandola should logically be an octave lower than a mandola.
Let's find a name for all these instruments. I vote for Grit's "Long necked mandolin".