senior status vs higher rank

senior status and higher rank both are nouns.

Word	Noun	Adjective	Verb	Adverb
senior status	Yes	No	No	No
higher rank	Yes	No	No	No

As nouns, senior status and higher rank are synonyms defined as:

senior status and higher rank: higher rank than that of others especially by reason of longer service

Other synonyms of senior status include higher status, seniority.

senior status (noun)	higher rank (noun)
higher rank than that of others especially by reason of longer service	higher rank than that of others especially by reason of longer service