document vs source

document and source both are nouns.

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

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

document: writing that provides information (especially information of an official nature)
source: a document (or organization) from which information is obtained

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

document (noun)	source (noun)
anything serving as a representation of a person's thinking by means of symbolic marks	a facility where something is available
writing that provides information (especially information of an official nature)	anything that provides inspiration for later work
(computer science) a computer file that contains text (and possibly formatting instructions) using seven-bit ASCII characters	a document (or organization) from which information is obtained
a written account of ownership or obligation	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

document (verb)	source (verb)
support or supply with references	specify the origin of
record in detail	get (a product) from another country or business