Words I Don't Know: Paranoia and phobias.

cliquetator (n.):  the dictator of a clique.
insouciance (n.):  lack of care or concern; indifference.
prophylaxis (n.):  the preventing of disease.
triangulate (adj., v.):  composed of or marked with triangles.
semaphore (n., v.):  an apparatus for conveying information by means of visual signals, as a light whose position may be changed.
sisal (n.):  a Mexican agave plant, Agave sisalana,  cultivated for its large fleshy leaves, which yield a stiff fibre used for making rope.
pusillanimous (adj.):  lacking courage or resolution; cowardly; faint-hearted; timid.
epistaxiophobia (n.):  fear of nosebleeds.
rhabdophobia (n.):  Fear of being severely punished or beaten by a rod, or of being severely criticized.
agliophobia (n.):  fear of pain.
gymnophobia (n.):  fear of nudity.
athazagoraphobia (n.):  fear of being forgotten or ignored or forgetting.
gypsum (n.):  a very common mineral, hydrated calcium sulfate, CaSO ₄ ⋅2H ₂ O, occurring in crystals and in masses, soft enough to be scratched by the fingernail: used to make plaster of Paris.
calcaneus (n.):  the largest tarsal bone, forming the prominence of the heel.
defenestration (n.):  the act of throwing a thing or esp. a person out of a window.
aubergine (n.):  a dark purplish color.

 

definitions from dictionary.reference.com except "cliquetator", which is not a real word.  phobia definitions from phobialist.com