I admit right off that I already have an opinion of what these terms mean (surprise!). But, I also recognize that I am sometimes wrong (rarely, but it happens. ) I've created this thread in hopes that I can learn from our more learned Science types here at OC.net, especially since they seem to be the most vociferous. Seriously though, I am genuinely interested in the definitions of these two terms, whether or not they are genuinely at odds with one another, and whether or not either of them are compatible with Holy Orthodoxy. I realize that this will probably break down in an argument between two camps, and that the question will by no means be answered entirely. I just hope to gain a better understanding.
Well, I don't know that it's my position you're asking for, but I'll give it none the less.
I think these terms are defined more by social connotations than by technical meanings. I think that over the past few decades the term 'creationist' has pretty much been narrowed down to those who believe in a literal 7 day creation that happened 6000-10000 years ago and those who want such a belief to be emphasized in education, I wouldn't apply it to advocates of so-called theistic-evolution who are generally just people who accept prevailing scientific theories and wouldn't object to their promulgation, but still hold some religious beliefs. As a side note, I would argue that the 'Intelligent Design' advocates are really just creationists who have attempted to usurp those beliefs of religious people who accept evolution, in order to advance the propaganda and agenda of creationism.
As for 'evolutionist', traditionally it has simply been a term that creationists, for some reason that is beyond me, believe is derogatory to those who hold the prevailing scientific theories. Technically speaking, it would apply to anyone who doesn't think the earth was created 6000 years ago, but it's comes across as almost laughable, akin to calling people who believe in gravity 'gravitationalists' or those who calling those who accept the theory of relativity 'relativists'.