What words are extremely hard to spell?

Jeff Grant, Word Ways, May, 1989, Volume 22, Number 2, pp. 107-8, 128

bouillabaisse        boo-yah-baze
caoutchoucin        koo-choo-sin
carillon(n)eur        ka-rill-yon-err
dyspnoea        dis-nee-uh
eisteddfodau        ess-teth-vod-eye
eschscholtzia        esh-olt-see-uh
homoiousia        hoe-moy-ooz-ee-uh
Houyhnhnm        hwin-um
intussuscipiens        in-tuh-suh-sip-ee-uns
kwashiorkor        kwosh-ee-or-cor
mlechchha        mletch-char
Nietzschean        nee-chee-in
Orszaggyules        or-sargg-dyu-laze
Phacochoerus        fay-ko-key-riss
pr(a)emunire        pree-myu-nigh-ree
Pterichthys        tur-ick-thiss
rijsttafel        rye-stoffel
Shabuoth        shuh-voo-oss
syssitia        siss-ish-uh
Takhtadjy        tarc-tar-jee
vichyssoise        vee-shee-swahz
yuffrouw        yew-frou