sea steps vs sea ladder

sea steps and sea ladder both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea steps	Yes	No	No	No
sea ladder	Yes	No	No	No

As nouns, sea steps and sea ladder are synonyms defined as:

sea steps and sea ladder: (nautical) ladder to be lowered over a ship's side for coming aboard

sea steps (noun)	sea ladder (noun)
(nautical) ladder to be lowered over a ship's side for coming aboard	(nautical) ladder to be lowered over a ship's side for coming aboard