oil of turpentine vs turpentine

oil of turpentine and turpentine both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil of turpentine	Yes	No	No	No
turpentine	Yes	No	No	No

As nouns, oil of turpentine and turpentine are synonyms defined as:

oil of turpentine and turpentine: volatile liquid distilled from turpentine oleoresin; used as paint thinner and solvent and medicinally

Other synonyms of oil of turpentine include spirit of turpentine, turps.

oil of turpentine (noun)	turpentine (noun)
volatile liquid distilled from turpentine oleoresin; used as paint thinner and solvent and medicinally	an oleoresin obtained from conifers (especially pines)
	volatile liquid distilled from turpentine oleoresin; used as paint thinner and solvent and medicinally