Semantics, the scientific study of meanings which is related to Grammar,Morpho-Syntax and Phonetics and it also has lots of Importance with respect to linguistic literacy.
The meanings of these words;
Arcane~difficult to understand
Angelocracy~the government of the angels
Theomeny~God's anger
Theodidact~God's student
Autodidact~self-taught person
Cacodemonomaniac~being possessed by the demons
Esoteric~known to selected few people
Unfathomable~incomprehensible
Fathomable~comprehensible
Discombobulation~confusion