merestone vs meerestone

merestone and meerestone both are nouns.

Word	Noun	Adjective	Verb	Adverb
merestone	Yes	No	No	No
meerestone	Yes	No	No	No

As nouns, merestone and meerestone are synonyms defined as:

merestone and meerestone: an old term for a landmark that consisted of a pile of stones surmounted by an upright slab

Other synonyms of merestone include mearstone.

merestone (noun)	meerestone (noun)
an old term for a landmark that consisted of a pile of stones surmounted by an upright slab	an old term for a landmark that consisted of a pile of stones surmounted by an upright slab