Noldorin 

gûl

noun. magic
Noldorin [Ety/ÑGOL] Group: Eldamo. Published by

gûl

noun. magic lore, long study (being used mostly of secret knowledge, especially such as possessed by artificers who made wonderful things)
Noldorin [Ety/377, S/432, MR/350, WJ/383] Group: Hiswelókë's Sindarin Dictionary. Published by

gûl

noun. perverted or evil knowledge, sorcery, necromancy
Noldorin [Ety/377, S/432, MR/350, WJ/383] Group: Hiswelókë's Sindarin Dictionary. Published by