ratline vs ratlin

ratline and ratlin both are nouns.

Word	Noun	Adjective	Verb	Adverb
ratline	Yes	No	No	No
ratlin	Yes	No	No	No

As nouns, ratline and ratlin are synonyms defined as:

ratline and ratlin: (nautical) a small horizontal rope between the shrouds of a sailing ship; they form a ladder for climbing aloft

ratline (noun)	ratlin (noun)
(nautical) a small horizontal rope between the shrouds of a sailing ship; they form a ladder for climbing aloft	(nautical) a small horizontal rope between the shrouds of a sailing ship; they form a ladder for climbing aloft