head of hair vs mane

head of hair and mane both are nouns.

Word	Noun	Adjective	Verb	Adverb
head of hair	Yes	No	No	No
mane	Yes	No	No	No

As nouns, head of hair and mane are synonyms defined as:

head of hair and mane: growth of hair covering the scalp of a human being

head of hair (noun)	mane (noun)
growth of hair covering the scalp of a human being	long coarse hair growing from the crest of the animal's neck
	growth of hair covering the scalp of a human being