cadastre vs cadaster

cadastre and cadaster both are nouns.

Word	Noun	Adjective	Verb	Adverb
cadastre	Yes	No	No	No
cadaster	Yes	No	No	No

As nouns, cadastre and cadaster are synonyms defined as:

cadastre and cadaster: a public register showing the details of ownership and value of land; made for the purpose of taxation

cadastre (noun)	cadaster (noun)
a public register showing the details of ownership and value of land; made for the purpose of taxation	a public register showing the details of ownership and value of land; made for the purpose of taxation