Complimentary/complementary seem to be just about mutually interchangeable now, and nearly always wrong! As is seperate, acomodate, comunicate, etc.

As for pronunciation, nearly everyone who is not French says Deja vous (pron.voo) meaning already you, instead of Deja vu (pron. more like view)meaning already seen, which is what it really means.

I like the medical ones, e.g. prostrate intead of prostate, or the lady who told us she had "ballistic kidneys" when she had the polycystic variety! But nearly every newscaster talks about cervical with emphasis on the first syllable, whereas most medics say cerveyecal, with emphasis on the second.

As for the apostrophe's everywhere these day's!