source vs wellspring

source and wellspring both are nouns.

Word	Noun	Adjective	Verb	Adverb
source	Yes	No	Yes	No
wellspring	Yes	No	No	No

As nouns, wellspring is a hyponym of source; that is, wellspring is a word with a more specific, narrower meaning than source:

Other hyponyms of source include source materials, fountainhead, well.

As nouns, wellspring is a hyponym of source; that is, wellspring is a word with a more specific, narrower meaning than source:

source (noun)	wellspring (noun)
a facility where something is available	an abundant source
anything that provides inspiration for later work	the source of water for a well
a document (or organization) from which information is obtained
a publication (or a passage from a publication) that is referred to
the place where something begins, where it springs into being
anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies
someone who originates or causes or initiates something
a person who supplies information
(technology) a process by which energy or a substance enters a system

source (verb)	wellspring (verb)
specify the origin of
get (a product) from another country or business