Sentence:  There are many kinds of "<WSD>Leech</WSD>" or "healer" as there are healing techniques, some are more powerful than others and some are very specific to certain illnesses and complaints; some use potions and unguents, others crystals and stones, others galdr and some work their healing from within the hidden realms themselves. 
Meaning of the word marked with <WSD> tags:  A healer.