low-lying vs sea-level

low-lying and sea-level both are adjectives.

Word	Noun	Adjective	Verb	Adverb
low-lying	No	Yes	No	No
sea-level	No	Yes	No	No

As adjectives, low-lying and sea-level are synonyms defined as:

low-lying (adjective)	sea-level (adjective)
having a small elevation above the ground or horizon or sea level	lying below the normal level
lying below the normal level