weather deck vs shelter deck

weather deck and shelter deck both are nouns.

Word	Noun	Adjective	Verb	Adverb
weather deck	Yes	No	No	No
shelter deck	Yes	No	No	No

As nouns, weather deck and shelter deck are synonyms defined as:

weather deck and shelter deck: upper deck having no overhead protection from the weather, but sheltering the deck below

weather deck (noun)	shelter deck (noun)
upper deck having no overhead protection from the weather, but sheltering the deck below	upper deck having no overhead protection from the weather, but sheltering the deck below