spring water vs well water

spring water and well water both are nouns.

Word	Noun	Adjective	Verb	Adverb
spring water	Yes	No	No	No
well water	Yes	No	No	No

As nouns, spring water and well water are synonyms defined as:

spring water and well water: underground water that is held in the soil and in pervious rocks

Other synonyms of spring water include ground water.

spring water (noun)	well water (noun)
water from a spring	underground water that is held in the soil and in pervious rocks
underground water that is held in the soil and in pervious rocks