As nouns the difference between retro and ana
is that
retro is something, such as a fashion, from the past; a retro trend while
ana is a collection of things associated with a person or place, especially a personal collection of anecdotes or conversations at table.
As an adjective retro
is of, or relating to, the past, past times, or the way things were.
As an adverb ana is
(
in prescriptions) Of each; an equal quantity; as, wine and honey, ana (or contracted to aa), / ij. (that is, of wine and honey, each, two ounces).
As an initialism ANA is
All Nippon Airways