seneschal vs major-domo

seneschal and major-domo both are nouns.

Word	Noun	Adjective	Verb	Adverb
seneschal	Yes	No	No	No
major-domo	Yes	No	No	No

As nouns, seneschal and major-domo are synonyms defined as:

seneschal and major-domo: the chief steward or butler of a great household

seneschal (noun)	major-domo (noun)
the chief steward or butler of a great household	the chief steward or butler of a great household