Douglas scale vs international sea and swell scale

Douglas scale and international sea and swell scale both are nouns.

Word	Noun	Adjective	Verb	Adverb
Douglas scale	Yes	No	No	No
international sea and swell scale	Yes	No	No	No

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

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

Other synonyms of Douglas scale include Douglas sea scale.

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