letter vs name and address

letter and name and address both are nouns.

Word	Noun	Adjective	Verb	Adverb
letter	Yes	No	Yes	No
name and address	Yes	No	No	No

letter (noun)	name and address (noun)
a written message addressed to a person or organization	written directions for finding some location; written on letters or packages that are to be delivered to that location
the conventional characters of the alphabet used to represent speech
an award earned by participation in a school sport
a strictly literal interpretation (as distinct from the intention)
owner who lets another person use something (housing usually) for hire

letter (verb)	name and address (verb)
mark letters on or mark with letters
set down or print with letters
win an athletic letter