Synonyms of the word 
ARCANE → ESOTERIC
arcane
- adj. understood by only a few.
- adj. obscure, mysterious.
- adj. requiring secret or mysterious knowledge to understand.
esoteric
- adj. intended for or likely to be understood by only a small number of people with a specialized knowledge…
- adj. Having to do with concepts that are highly theoretical and without obvious practical application; often…
- adj. Confidential; private.
- n. An esoteric doctrine or treatise; esoteric philosophy.
- n. One who believes, or is an initiate, in esoteric doctrines or rites.
If you are interested in words, visit the following sites :
- wiktionary.org/arcane For complete definition of a word
- 1word.ws/arcane to play with words, suffixs, prefixs, etc.