high-ranking vs upper-level

high-ranking and upper-level both are adjectives.

Word	Noun	Adjective	Verb	Adverb
high-ranking	No	Yes	No	No
upper-level	No	Yes	No	No

As adjectives, high-ranking and upper-level are synonyms defined as:

high-ranking and upper-level: at an elevated level in rank or importance

Other synonyms of high-ranking include high-level.

high-ranking (adjective)	upper-level (adjective)
at an elevated level in rank or importance	at an elevated level in rank or importance