singing vs private instructor

singing and private instructor both are nouns.

Word	Noun	Adjective	Verb	Adverb
singing	Yes	Yes	No	No
private instructor	Yes	No	No	No

singing (noun)	private instructor (noun)
the act of singing vocal music	a person who gives private instruction (as in singing, acting, etc.)
disclosing information or giving evidence about another

singing (adjective)	private instructor (adjective)
smooth and flowing