memo vs position paper

memo and position paper both are nouns.

Word	Noun	Adjective	Verb	Adverb
memo	Yes	No	No	No
position paper	Yes	No	No	No

As nouns, position paper is a hyponym of memo; that is, position paper is a word with a more specific, narrower meaning than memo:

memo: a written proposal or reminder
position paper: a memorandum summarizing the items of an agreement (used especially in diplomatic communications)

Other hyponyms of memo include aide-memoire.

memo (noun)	position paper (noun)
a written proposal or reminder	a report that explains or justifies or recommends some particular policy
	a memorandum summarizing the items of an agreement (used especially in diplomatic communications)