headspring vs fountainhead

headspring and fountainhead both are nouns.

Word	Noun	Adjective	Verb	Adverb
headspring	Yes	No	No	No
fountainhead	Yes	No	No	No

As nouns, headspring and fountainhead are synonyms defined as:

headspring and fountainhead: the source of water from which a stream arises

Other synonyms of headspring include head.

headspring (noun)	fountainhead (noun)
the source of water from which a stream arises	an abundant source
	the source of water from which a stream arises