Knowing a word involves knowing its meaning| its form and its use. If we say that we know a word| we must be able to
a) recognize it in written and spoken form;
b) recall it at once;
c) relate it to appropriate object or concept;
d) use it in appropriate grammatical form;
e) use it in correct collocation;
f) use it at appropriate level of formality;
g) pronounce it in a recognizable way;
h) spell it correctly;
i) be aware of its connotation.