source vs document

source and document both are nouns.

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

As nouns, document is a hypernym of source; that is, document is a word with a broader meaning than source:

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

Other hypernyms of source include papers, written document.

As verbs, document is a hypernym of source; that is, document is a word with a broader meaning than source:

source (noun)	document (noun)
a facility where something is available	anything serving as a representation of a person's thinking by means of symbolic marks
anything that provides inspiration for later work	writing that provides information (especially information of an official nature)
a document (or organization) from which information is obtained	(computer science) a computer file that contains text (and possibly formatting instructions) using seven-bit ASCII characters
a publication (or a passage from a publication) that is referred to	a written account of ownership or obligation
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)	document (verb)
specify the origin of	support or supply with references
get (a product) from another country or business	record in detail