Douglas scale vs Douglas sea scale

Douglas scale and Douglas sea scale both are nouns.

Word	Noun	Adjective	Verb	Adverb
Douglas scale	Yes	No	No	No
Douglas sea scale	Yes	No	No	No

As nouns, Douglas scale and Douglas sea scale are synonyms defined as:

Douglas scale and Douglas sea scale: scale used for measuring the height of waves

Other synonyms of Douglas scale include international sea and swell scale.

Douglas scale (noun)	Douglas sea scale (noun)
scale used for measuring the height of waves	scale used for measuring the height of waves