load line vs Plimsoll line

load line and Plimsoll line both are nouns.

Word	Noun	Adjective	Verb	Adverb
load line	Yes	No	No	No
Plimsoll line	Yes	No	No	No

As nouns, load line and Plimsoll line are synonyms defined as:

load line and Plimsoll line: waterlines to show the level the water should reach when the ship is properly loaded

Other synonyms of load line include Plimsoll, Plimsoll mark.

load line (noun)	Plimsoll line (noun)
waterlines to show the level the water should reach when the ship is properly loaded	waterlines to show the level the water should reach when the ship is properly loaded