middy blouse vs middy

middy blouse and middy both are nouns.

Word	Noun	Adjective	Verb	Adverb
middy blouse	Yes	No	No	No
middy	Yes	No	No	No

As nouns, middy blouse and middy are synonyms defined as:

middy blouse (noun)	middy (noun)
blouse with a sailor collar	blouse with a sailor collar